diff --git a/doc/src/sgml/advanced.sgml b/doc/src/sgml/advanced.sgml
index 8af6fcc..a59701a 100644
--- a/doc/src/sgml/advanced.sgml
+++ b/doc/src/sgml/advanced.sgml
@@ -12,7 +12,7 @@
    availability. Watchdog is used to resolve the single point of
    failure by coordinating multiple
    <productname>Pgpool-II</productname> nodes. The watchdog was first
-   introduced in <productname>pgpool-II</productname>
+   introduced in <productname>Pgpool-II</productname>
    <emphasis>V3.2</emphasis> and is significantly enhanced in
    <productname>Pgpool-II</productname> <emphasis>V3.5</emphasis>, to
    ensure the presence of a quorum at all time. This new addition to
@@ -417,7 +417,7 @@
        the "NODES LIST DATA" result packet.
     </para>
     <para>
-     The result packet returnd by watchdog for the "GET NODES LIST"
+     The result packet returned by watchdog for the "GET NODES LIST"
      will contains the list of all configured watchdog nodes to do
      health check on in the <acronym>JSON</acronym> format.
      The <acronym>JSON</acronym> of the watchdog nodes contains the
@@ -523,7 +523,7 @@
     status and brings the virtual IP assigned to watchdog down.
     Thus clients of <productname>Pgpool-II</productname> cannot
     connect to <productname>Pgpool-II</productname> using the
-    virtual IP any more. This is neccessary to avoid split-brain,
+    virtual IP any more. This is necessary to avoid split-brain,
     that is, situations where there are multiple active
     <productname>Pgpool-II</productname>.
    </para>
diff --git a/doc/src/sgml/client-auth.sgml b/doc/src/sgml/client-auth.sgml
index 815b329..be460ef 100644
--- a/doc/src/sgml/client-auth.sgml
+++ b/doc/src/sgml/client-auth.sgml
@@ -13,8 +13,8 @@
   a <productname>PostgreSQL</productname> database client, so when a
   client application connects to
   the <productname>Pgpool-II</productname>, <productname>Pgpool-II</productname>
-  inturn connects to the <productname>PostgreSQL</productname> servers
-  using the same credentials to serve the incomming client
+  in turn connects to the <productname>PostgreSQL</productname> servers
+  using the same credentials to serve the incoming client
   connection. Thus, all the access privileges and restrictions defined
   for the user in <productname>PostgreSQL</productname> gets
   automatically applied to all <productname>Pgpool-II</productname>
@@ -28,7 +28,7 @@
   <productname>Pgpool-II</productname> server and not that of the actual client.
   Therefore, for the client host based authentications <productname>Pgpool-II</productname> has the
   <literal>pool_hba</literal> mechanism similar to the <literal>pg_hba</literal> mechanism for
-  authenticating the incomming client connections.
+  authenticating the incoming client connections.
  </para>
 
  <sect1 id="auth-pool-hba-conf">
diff --git a/doc/src/sgml/connection-pooling.sgml b/doc/src/sgml/connection-pooling.sgml
index e7d6263..d88a18f 100644
--- a/doc/src/sgml/connection-pooling.sgml
+++ b/doc/src/sgml/connection-pooling.sgml
@@ -122,7 +122,7 @@
      </para>
 
      <para>
-      But serialization has its own overheads, and it is recomended
+      But serialization has its own overheads, and it is recommended
       to be used only with the larger values of <xref linkend="guc-num-init-children">.
        For the small number of <xref linkend="guc-num-init-children">,
 	the serialize accept can degrade the performance because of
@@ -131,8 +131,8 @@
 
      <note>
       <para>
-       It is recomended to do a benchmark before deciding wether to use
-       <varname>serialize_accept</varname> or not, because the corelation
+       It is recommended to do a benchmark before deciding whether to use
+       <varname>serialize_accept</varname> or not, because the correlation
        of <xref linkend="guc-num-init-children"> and <varname>serialize_accept</varname>
 	can be different on different environments.
       </para>
diff --git a/doc/src/sgml/connection-settings.sgml b/doc/src/sgml/connection-settings.sgml
index 2fe5051..7b65792 100644
--- a/doc/src/sgml/connection-settings.sgml
+++ b/doc/src/sgml/connection-settings.sgml
@@ -758,7 +758,7 @@
       <productname>Pgpool-II</productname> <emphasis>V2.2</emphasis>
       or later, automatically detects whether the table has a
       SERIAL columns or not, so it never locks the table if it
-      desn't have the SERIAL columns.
+      doesn't have the SERIAL columns.
      </para>
 
      <para>
diff --git a/doc/src/sgml/example-AWS.sgml b/doc/src/sgml/example-AWS.sgml
index 40bc138..daa63c6 100644
--- a/doc/src/sgml/example-AWS.sgml
+++ b/doc/src/sgml/example-AWS.sgml
@@ -67,7 +67,7 @@
     <xref linkend="guc-delegate-ip"> which we will not set in this example instead
      we will use <xref linkend="guc-wd-escalation-command"> and
       <xref linkend="guc-wd-de-escalation-command"> to switch the
-       Elastic IP address to the maste/Active <productname>Pgpool-II</productname> node.
+       Elastic IP address to the master/Active <productname>Pgpool-II</productname> node.
   </para>
 
   <sect3 id="example-AWS-pgpool-config-instance-1">
diff --git a/doc/src/sgml/example-Aurora.sgml b/doc/src/sgml/example-Aurora.sgml
index 44bb043..004e995 100644
--- a/doc/src/sgml/example-Aurora.sgml
+++ b/doc/src/sgml/example-Aurora.sgml
@@ -29,7 +29,7 @@
       Set <xref linkend="guc-sr-check-period"> to 0 to
        disable streaming replication delay checking.  This
        is because <productname>Aurora</productname> does
-       not provide neccessary functions to check the
+       not provide necessary functions to check the
        replication delay.
      </para>
     </listitem>
@@ -53,7 +53,7 @@
        Aurora writer node.  Set
        other <xref linkend="guc-backend-hostname"> for the
 	Aurora reader node.  Set
-	appropreate <xref linkend="guc-backend-weight"> as
+	appropriate <xref linkend="guc-backend-weight"> as
 	 usual. You don't need to
 	 set <xref linkend="guc-backend-data-directory">
      </para>
diff --git a/doc/src/sgml/example-basic.sgml b/doc/src/sgml/example-basic.sgml
index ec6e62a..5cffd49 100644
--- a/doc/src/sgml/example-basic.sgml
+++ b/doc/src/sgml/example-basic.sgml
@@ -69,7 +69,7 @@
      $ cp /usr/local/etc/pgpool.conf.sample /usr/local/etc/pgpool.conf
     </programlisting>
     <productname>Pgpool-II</productname> only accepts connections from the localhost
-    using port 9999 by the default. If you wish to receive conenctions from other hosts,
+    using port 9999 by the default. If you wish to receive connections from other hosts,
     set <xref linkend="guc-listen-addresses"> to <literal>'*'</literal>.
      <programlisting>
       listen_addresses = 'localhost'
diff --git a/doc/src/sgml/example-cluster.sgml b/doc/src/sgml/example-cluster.sgml
index f14753d..7d7a9a5 100644
--- a/doc/src/sgml/example-cluster.sgml
+++ b/doc/src/sgml/example-cluster.sgml
@@ -254,7 +254,7 @@
       <thead>
        <row>
 	<entry>User Name</entry>
-	<entry>Passowrd</entry>
+	<entry>Password</entry>
 	<entry>Detail</entry>
        </row>
       </thead>
@@ -351,7 +351,7 @@
      To allow <literal>repl</literal> user without specifying password for streaming 
      replication and online recovery, and execute <application>pg_rewind</application>
      using <literal>postgres</literal>, we create the <filename>.pgpass</filename> file 
-     in <literal>postgres</literal> user's home directory and change the permisson to 
+     in <literal>postgres</literal> user's home directory and change the permission to
      <literal>600</literal> on each <productname>PostgreSQL</productname> server.
     </para>
     <programlisting>
@@ -390,7 +390,7 @@
    <para>
     When installing <productname>Pgpool-II</productname> from RPM,  all the 
     <productname>Pgpool-II</productname> configuration files are in <filename>/etc/pgpool-II</filename>. 
-    In this example, we copy the sample configuration file for streaming replicaton mode.
+    In this example, we copy the sample configuration file for streaming replication mode.
    </para>
    <programlisting>
     # cp -p /etc/pgpool-II/pgpool.conf.sample-stream /etc/pgpool-II/pgpool.conf
@@ -433,7 +433,7 @@
     health_check_max_retries = 3
    </programlisting>
    <para>
-    Specify the <productname>PostgreSQL</productname> backend informations.
+    Specify the <productname>PostgreSQL</productname> backend information.
     Multiple backends can be specified by adding a number at the end of the parameter name.
    </para>
    <programlisting>
@@ -1003,7 +1003,7 @@ exit 0
      </programlisting>
    </para>
    <para>
-    Execute command <command>pg_enc -m -k /path/to/.pgpoolkey -u username -p</command> to regist user 
+    Execute command <command>pg_enc -m -k /path/to/.pgpoolkey -u username -p</command> to register user
     name and <literal>AES</literal> encrypted password in file <filename>pool_passwd</filename>.
     If <filename>pool_passwd</filename> doesn't exist yet, it will be created in the same directory as
     <filename>pgpool.conf</filename>.
@@ -1411,7 +1411,7 @@ arping_path = '/usr/sbin'
    </programlisting>
    <para>
     After executing <command>pcp_recovery_node</command> command, 
-    vertify that <literal>server2</literal> and <literal>server3</literal> 
+    verify that <literal>server2</literal> and <literal>server3</literal>
     are started as <productname>PostgreSQL</productname> standby server.
    </para>
    <programlisting>
@@ -1459,7 +1459,7 @@ arping_path = '/usr/sbin'
    </programlisting>
    <para>
     Start <productname>Pgpool-II</productname> (<literal>server1</literal>) which we have stopped again,
-    and vertify that <literal>server1</literal> runs as a standby.
+    and verify that <literal>server1</literal> runs as a standby.
    </para>
    <programlisting>
     [server1]# systemctl start pgpool.service
@@ -1478,7 +1478,7 @@ arping_path = '/usr/sbin'
    <title>Failover</title>
    <para>
     First, use <command>psql</command> to connect to <productname>PostgreSQL</productname> via virtual IP,
-    and verify the backend informations.
+    and verify the backend information.
    </para>
    <programlisting>
     # psql -h 192.168.137.150 -p 9999 -U pgpool postgres -c "show pool_nodes"
diff --git a/doc/src/sgml/example-watchdog.sgml b/doc/src/sgml/example-watchdog.sgml
index 622f632..1021843 100644
--- a/doc/src/sgml/example-watchdog.sgml
+++ b/doc/src/sgml/example-watchdog.sgml
@@ -158,7 +158,7 @@
      [root@osspc20]# {installed_dir}/bin/pgpool -n -f {installed_dir}/etc/pgpool.conf > pgpool.log 2>&1
     </programlisting>
     Log messages will show that <productname>Pgpool-II</productname>
-    has joind the watchdog cluster as standby watchdog.
+    has joined the watchdog cluster as standby watchdog.
     <programlisting>
      LOG:  watchdog cluster configured with 1 remote nodes
      LOG:  watchdog remote node:0 on Linux_osspc16_9000:9000
diff --git a/doc/src/sgml/failover.sgml b/doc/src/sgml/failover.sgml
index 47f56a6..00c54c5 100644
--- a/doc/src/sgml/failover.sgml
+++ b/doc/src/sgml/failover.sgml
@@ -269,7 +269,7 @@
       Specifies a user command to run when a <productname>PostgreSQL</> backend node gets attached to
       <productname>Pgpool-II</productname>. <productname>Pgpool-II</productname>
       replaces the following special characters with the backend specific information.
-      before excuting the command.
+      before executing the command.
      </para>
 
      <table id="ffailback-command-table">
@@ -665,7 +665,7 @@
      <para>
       When set to on, standby node be automatically failback, if the node status
       is down but streaming replication works normally. This is useful when
-      standby node is degenerated by pgpool because of the tempolary network failure.
+      standby node is degenerated by pgpool because of the temporary network failure.
      </para>
 
      <para>
@@ -673,7 +673,7 @@
        must be enabled, and <productname>PostgreSQL</productname> 9.1 or later
        is required as backend nodes. This feature use <function>pg_stat_replicatoin</function>
        on primary node, the automatic failback is performed to standby node only.
-       Note that failback_command will be executed as well if failback_commnad is not empty.
+       Note that failback_command will be executed as well if failback_command is not empty.
        If you plan to detach standby node for maintenance, set this parameter to off beforehand.
        Otherwise it's possible that standby node is reattached against your intention.
      </para>
diff --git a/doc/src/sgml/installation-rpm.sgml b/doc/src/sgml/installation-rpm.sgml
index 090fce5..de248f2 100644
--- a/doc/src/sgml/installation-rpm.sgml
+++ b/doc/src/sgml/installation-rpm.sgml
@@ -4,7 +4,7 @@
  <title>Installation from RPM</title>
  <para>
   This chapter describes the installation
-  of <productname>Pgpool-II</productname> from PRM.  If you are
+  of <productname>Pgpool-II</productname> from RPM.  If you are
   going to install from the source code, please
   check <xref linkend="install-source">.
  </para>
diff --git a/doc/src/sgml/installation.sgml b/doc/src/sgml/installation.sgml
index 1167e47..c8c8730 100644
--- a/doc/src/sgml/installation.sgml
+++ b/doc/src/sgml/installation.sgml
@@ -63,7 +63,7 @@
      Although it is possible to use only one
      <productname>Pgpool-II</productname>, we recommend to use more
      than 1 <productname>Pgpool-II</productname> to avoid whole
-     database inavailability due to the
+     database unavailability due to the
      <productname>Pgpool-II</productname> being down. Multiple
      <productname>Pgpool-II</productname> work together and monitor
      each other. One of them is called "master" and it has a virtual
@@ -76,7 +76,7 @@
     </para>
     <para>
      Since it is not allowed to have multiple master, watchdog votes to
-     deicude a new master. If there are even number of
+     decide a new master. If there are even number of
      <productname>Pgpool-II</productname>, it is impossible to decide
      the new master by voting. Thus we recommend to deploy
      <productname>Pgpool-II</productname> in more than 3 odd numbers.
@@ -95,7 +95,7 @@
      <productname>PostgreSQL</productname> in streaming replication
      mode in <xref linkend="example-cluster"> for those who want to
      have a production level <productname>Pgpool-II</productname>
-     installtion today.
+     installation today.
     </para>
    </sect2>
   </sect1>
@@ -358,10 +358,10 @@
   <para>
    <productname>Pgpool-II</productname> need function of <function>pgpool_recovery</function>,
    <function>pgpool_remote_start</function> and <function>pgpool_switch_xlog</function>,
-   when you use the online recovery that discribes latter.
+   when you use the online recovery that describes latter.
    Also pgpoolAdmin of management tool, stop, restart or reload a
    <productname>PostgreSQL</productname> on the screen by use <function>pgpool_pgctl</function>.
-   It is enough, if these function installed in template1 fisrt. These
+   It is enough, if these function installed in template1 first. These
    function do not needed that install in all databases.
   </para>
 
diff --git a/doc/src/sgml/loadbalance.sgml b/doc/src/sgml/loadbalance.sgml
index ff5c444..07704a2 100644
--- a/doc/src/sgml/loadbalance.sgml
+++ b/doc/src/sgml/loadbalance.sgml
@@ -181,7 +181,7 @@
 
     <listitem>
      <para>
-      COPY TO STODUT
+      COPY TO STDOUT
      </para>
     </listitem>
 
@@ -207,7 +207,7 @@
   </para>
 
   <para>
-   If writing queires appear, succeeding read queries may not be
+   If writing queries appear, succeeding read queries may not be
    load balanced. i.e. sent to primary node (in streaming
    replication mode) or master node (in other mode) depending on the
    setting of <xref linkend="guc-disable-load-balance-on-write">.
@@ -657,7 +657,7 @@
 	 </listitem>
 	 <listitem>
 	  <para>
-	   SQL including table_nama3
+	   SQL including table_name3
 	  </para>
 	 </listitem>
 	</itemizedlist>
@@ -864,13 +864,13 @@
 
      <caution>
       <para>
-       <acronym>JDBC</acronym> driver postgreSQL-9.3 and earlier versions
+       <acronym>JDBC</acronym> driver PostgreSQL-9.3 and earlier versions
        does not send the application name in the startup packet even if
        the application name is specified using the <acronym>JDBC</acronym>
        driver option <literal>"ApplicationName"</literal> and
        <literal>"assumeMinServerVersion=9.0"</literal>.
        So if you want to use the <xref linkend="guc-app-name-redirect-preference-list">
-	feature through <acronym>JDBC</acronym>, Use postgreSQL-9.4 or later version of the driver.
+	feature through <acronym>JDBC</acronym>, Use PostgreSQL-9.4 or later version of the driver.
       </para>
      </caution>
 
diff --git a/doc/src/sgml/memcache.sgml b/doc/src/sgml/memcache.sgml
index dea6a5d..48edf30 100644
--- a/doc/src/sgml/memcache.sgml
+++ b/doc/src/sgml/memcache.sgml
@@ -421,7 +421,7 @@
      </para>
 
      <para>
-      <varname>memqcache_cache_block_size</varname> must be set to atleast 512.
+      <varname>memqcache_cache_block_size</varname> must be set to at least 512.
      </para>
 
      <para>
diff --git a/doc/src/sgml/misc-config.sgml b/doc/src/sgml/misc-config.sgml
index 0928d13..2e5a68d 100644
--- a/doc/src/sgml/misc-config.sgml
+++ b/doc/src/sgml/misc-config.sgml
@@ -17,7 +17,7 @@
      Specifies the relation cache expiration time in seconds.
      The relation cache is used for caching the query result of
      <productname>PostgreSQL</> system catalogs that is used by <productname>Pgpool-II
-     </productname> to get various informations including the table
+     </productname> to get various information including the table
      structures and to check table types(e.g. To check if the referred
      table is a temporary table or not). The cache is maintained in
      the local memory space of <productname>Pgpool-II</productname>
@@ -115,7 +115,7 @@
   <varlistentry id="guc-relcache-query-target" xreflabel="relcache_query_target">
    <term><varname>relcache_query_target</varname> (<type>enum</type>)
     <indexterm>
-     <primary><varname>relache_query_target</varname> configuration parameter</primary>
+     <primary><varname>relcache_query_target</varname> configuration parameter</primary>
     </indexterm>
    </term>
    <listitem>
@@ -136,7 +136,7 @@
      standby because it's much geographically closer. In this
      case you can set backend_weight0 (this represents primary)
      to 0, backend_weight1 to 1 (this represents standby) and set
-     relache_query_target
+     relcache_query_target
      to <literal>load_balance_node</literal>.
     </para>
     <para>
@@ -188,7 +188,7 @@
     </para>
     <note>
      <para>
-      For a backward compatibily sake for 4.0 or
+      For a backward compatibility sake for 4.0 or
       before, <productname>Pgpool-II</productname>
       accepts <literal>on</literal>, which is same
       as <literal>catalog</literal> and <literal>off</literal>,
diff --git a/doc/src/sgml/online-recovery.sgml b/doc/src/sgml/online-recovery.sgml
index 9a713e4..9cd2471 100644
--- a/doc/src/sgml/online-recovery.sgml
+++ b/doc/src/sgml/online-recovery.sgml
@@ -64,7 +64,7 @@
     <xref linkend="example-cluster-pgpool-config-online-recovery">.
  </para>
  <para>
-  Connections from cliens are not allowed only in the second stage
+  Connections from clients are not allowed only in the second stage
   while the data can be updated or retrieved during the first stage.
  </para>
  <para>
@@ -313,7 +313,7 @@
       database cluster directory for security reasons.
       For example, if <varname>recovery_2nd_stage_command</varname> = <literal>
        'sync-command'</literal>, then <productname>Pgpool-II</productname> will
-      look for the command scrit in <literal>$PGDATA</literal> directory and will
+      look for the command script in <literal>$PGDATA</literal> directory and will
       try to execute <command>$PGDATA/sync-command</command>.
     </para>
     <para>
diff --git a/doc/src/sgml/performance.sgml b/doc/src/sgml/performance.sgml
index 09a93ef..3f7594e 100644
--- a/doc/src/sgml/performance.sgml
+++ b/doc/src/sgml/performance.sgml
@@ -32,7 +32,7 @@
     in <productname>Pgpool-II</productname>: shared memory and
     process private memory. The former is allocated at the startup
     of <productname>Pgpool-II</productname> main server process
-    and will not be freeed until
+    and will not be freed until
     whole <productname>Pgpool-II</productname> servers shut down.
     The latter is allocated within
     each <productname>Pgpool-II</productname> child process and
@@ -43,7 +43,7 @@
     <title>Shared Memory Requirement</title>
 
     <para>
-     Here is a fomula to calculate the shared memory requirement.
+     Here is a formula to calculate the shared memory requirement.
      <programlisting>
       Shared memory requirement (in bytes) = <xref linkend="guc-num-init-children"> * <xref linkend="guc-max-pool"> * 17408
      </programlisting>
@@ -67,7 +67,7 @@
     <title>Process Memory Requirement</title>
     <para>
 
-     Here is a fomula to calculate the process memory requirement.
+     Here is a formula to calculate the process memory requirement.
      <programlisting>
       Process memory requirement in total (in mega bytes) = <xref linkend="guc-num-init-children"> * 5
      </programlisting>
@@ -105,8 +105,8 @@
    limit. There are several ways to deal with this problem.
   </para>
 
-  <sect2 id="controling-num-init-children">
-   <title>Controling num_init_children</title>
+  <sect2 id="controlling-num-init-children">
+   <title>Controlling num_init_children</title>
    <para>
     The obvious way to deal with the problem is increasing the
     number of child process. This can be done by
@@ -130,8 +130,8 @@
    </para>
   </sect2>
 
-  <sect2 id="controling-listen-backlog-multiplier">
-   <title>Controling listen_backlog_multiplier</title>
+  <sect2 id="controlling-listen-backlog-multiplier">
+   <title>Controlling listen_backlog_multiplier</title>
    <para>
     Another solution would be increasing the connection request
     queue. This could be done by
@@ -194,7 +194,7 @@
     the ratio specified by <xref linkend="guc-backend-weight">0
      and
      <xref linkend="guc-backend-weight">1. If those two values are
-      eqaul, the chance each node is chosen will be even.
+      equal, the chance each node is chosen will be even.
    </para>
 
    <para>
@@ -266,9 +266,9 @@
     or <xref linkend="guc-load-balance-mode"> is set to off,
      sometimes <productname>Pgpool-II</productname> needs to
      ask <productname>PostgreSQL</productname> to get meta
-     information, such as whether a table is a temporay one or
+     information, such as whether a table is a temporary one or
      not. To get those
-     information, <productname>Pgpool-II</productname> sends queires
+     information, <productname>Pgpool-II</productname> sends queries
      primary <productname>PostgreSQL</productname> which could be up
      to as many as 10 queries (in 4.1 or after, the number of queries
      has been decreased, it is not zero, however). To reduce the
diff --git a/doc/src/sgml/ref/pcp_detach_node.sgml b/doc/src/sgml/ref/pcp_detach_node.sgml
index e67563e..cf269db 100644
--- a/doc/src/sgml/ref/pcp_detach_node.sgml
+++ b/doc/src/sgml/ref/pcp_detach_node.sgml
@@ -17,7 +17,7 @@ Pgpool-II documentation
  <refnamediv>
   <refname>pcp_detach_node</refname>
   <refpurpose>
-   detaches the given node from Pgpool-II. Exisiting connections to Pgpool-II are forced to be disconnected.</refpurpose>
+   detaches the given node from Pgpool-II. Existing connections to Pgpool-II are forced to be disconnected.</refpurpose>
  </refnamediv>
 
  <refsynopsisdiv>
@@ -33,7 +33,7 @@ Pgpool-II documentation
   <title>Description</title>
   <para>
    <command>pcp_detach_node</command>
-   detaches the given node from Pgpool-II. Exisiting connections to Pgpool-II are forced to be disconnected.
+   detaches the given node from Pgpool-II. Existing connections to Pgpool-II are forced to be disconnected.
   </para>
  </refsect1>
 
diff --git a/doc/src/sgml/ref/pcp_watchdog_info.sgml b/doc/src/sgml/ref/pcp_watchdog_info.sgml
index b4d42e5..088a9df 100644
--- a/doc/src/sgml/ref/pcp_watchdog_info.sgml
+++ b/doc/src/sgml/ref/pcp_watchdog_info.sgml
@@ -52,7 +52,7 @@ Pgpool-II documentation
        Index 0 gets one's self watchdog information.
       </para>
       <para>
-       If ommitted then gets information of all watchdog nodes.
+       If omitted then gets information of all watchdog nodes.
       </para>
      </listitem>
     </varlistentry>
diff --git a/doc/src/sgml/ref/pgpool.sgml b/doc/src/sgml/ref/pgpool.sgml
index 978dab8..1665303 100644
--- a/doc/src/sgml/ref/pgpool.sgml
+++ b/doc/src/sgml/ref/pgpool.sgml
@@ -100,7 +100,7 @@ Pgpool-II documentation
      <listitem>
       <para>
        Set the path to the <filename>.pgpoolkey</filename> file.
-       Mandatory if you use AES256 encrypted password and the file is placed other than the standard locatiaon and used.
+       Mandatory if you use AES256 encrypted password and the file is placed other than the standard location and used.
       </para>
      </listitem>
     </varlistentry>
@@ -229,7 +229,7 @@ Pgpool-II documentation
   <para>
    Reload configuration file
    of <productname>Pgpool-II</productname>. No specific options
-   exist for realod mode. Common options are applicable.
+   exist for reload mode. Common options are applicable.
   </para>
  </refsect1>
 
diff --git a/doc/src/sgml/ref/show_pool_nodes.sgml b/doc/src/sgml/ref/show_pool_nodes.sgml
index 10b6107..2b1891a 100644
--- a/doc/src/sgml/ref/show_pool_nodes.sgml
+++ b/doc/src/sgml/ref/show_pool_nodes.sgml
@@ -35,9 +35,9 @@
    hostname, the port, the status, the weight (only meaningful if
    you use the load balancing mode), the role, the SELECT query
    counts issued to each backend, whether each node is the load
-   bakance node or not, the replication delay (only if in streaming
+   balance node or not, the replication delay (only if in streaming
    replication mode) and last status change time. In addition to
-   this replicatin state and sync state are shown for standby nodes
+   this replication state and sync state are shown for standby nodes
    in <productname>Pgpool-II</productname> 4.1 or after. The
    possible values in the status column are explained in
    the <xref linkend="pcp-node-info"> reference. If the hostname is
diff --git a/doc/src/sgml/reference.sgml b/doc/src/sgml/reference.sgml
index c8b4be2..0ceaec1 100644
--- a/doc/src/sgml/reference.sgml
+++ b/doc/src/sgml/reference.sgml
@@ -189,7 +189,7 @@
     to <productname>PostgreSQL</productname> with the result
     (3). <productname>PostgreSQL</productname> returns the result
     to <productname>Pgpool-II</productname> (5)
-    and <productname>Pgpool-II</productname> fowards the data to
+    and <productname>Pgpool-II</productname> forwards the data to
     the user (6).
    </para>
    <para>
@@ -214,7 +214,7 @@
     of <productname>PostgreSQL</productname>.  The pcp port number
     is hard coded as 9898, the pcp user name is assumes to be same
     as caller's <productname>PostgreSQL</productname> user name.
-    password is extraced from $HOME/.pcppass.
+    password is extracted from $HOME/.pcppass.
    </para>
 
    <sect1 id="installing-pgpool-adm">
diff --git a/doc/src/sgml/release-3.2.sgml b/doc/src/sgml/release-3.2.sgml
index ecb5816..4b446f3 100644
--- a/doc/src/sgml/release-3.2.sgml
+++ b/doc/src/sgml/release-3.2.sgml
@@ -216,7 +216,7 @@
     </para>
 
     <para>
-     This status mismatch should be fixe by pcp_promote_node, but when the node
+     This status mismatch should be fixed by pcp_promote_node, but when the node
      is the master node (the first alive node), it fails as mentioned above.
     </para>
 
@@ -299,7 +299,7 @@
     2016-12-28 [afebadf]
     -->
     <para>
-     Fix authentication timeout that can occur right after client connecttions. (Yugo Nagata)
+     Fix authentication timeout that can occur right after client connections. (Yugo Nagata)
     </para>
    </listitem>
 
diff --git a/doc/src/sgml/release-3.3.sgml b/doc/src/sgml/release-3.3.sgml
index cb3342c..38a376a 100644
--- a/doc/src/sgml/release-3.3.sgml
+++ b/doc/src/sgml/release-3.3.sgml
@@ -133,7 +133,7 @@
      Change the <filename>pgpool.service</filename> and sysconfig files to output <productname>Pgpool-II</productname> log. (Bo Peng)
     </para>
     <para>
-     Removeing "Type=forking" and add OPTS=" -n" to
+     Removing "Type=forking" and add OPTS=" -n" to
      run <productname>Pgpool-II</productname> with non-daemon mode, because we need to redirect logs.
      Using <command>"journalctl"</command> command to see <productname>Pgpool-II</productname> systemd log.
     </para>
@@ -167,7 +167,7 @@
      frontend. In most cases this is good. However if other than primary
      node or master node returns an error state (this could happen if load
      balance node is other than primary or master node and the query is an
-     errornous SELECT), this should be returned to frontend, because the
+     erroneous SELECT), this should be returned to frontend, because the
      frontend already received an error.
     </para>
    </listitem>
@@ -208,7 +208,7 @@
      Fix bug mistakenly overriding global backend status right after failover. (Tatsuo Ishii)
     </para>
     <para>
-     See <ulink url="http://www.sraoss.jp/pipermail/pgpool-general/2017-September/005786.html">[pgpool-general: 5728]</ulink> for mor details.
+     See <ulink url="http://www.sraoss.jp/pipermail/pgpool-general/2017-September/005786.html">[pgpool-general: 5728]</ulink> for more details.
     </para>
    </listitem>
 
@@ -416,7 +416,7 @@
     2017-03-24 [dab2ff0]
     -->
     <para>
-     Fix for 0000296: PGPool v3.6.2 terminated by systemd because the service Type has been set to 'forking'.
+     Fix for 0000296: Pgpool v3.6.2 terminated by systemd because the service Type has been set to 'forking'.
      <ulink url="http://www.pgpool.net/mantisbt/view.php?id=296">(Bug 296)</ulink> (Muhammad Usama)
     </para>
    </listitem>
@@ -476,7 +476,7 @@
     </para>
 
     <para>
-     This status mismatch should be fixe by pcp_promote_node, but when the node
+     This status mismatch should be fixed by pcp_promote_node, but when the node
      is the master node (the first alive node), it fails as mentioned above.
     </para>
 
@@ -589,7 +589,7 @@
     2016-12-28 [afebadf]
     -->
     <para>
-     Fix authentication timeout that can occur right after client connecttions. (Yugo Nagata)
+     Fix authentication timeout that can occur right after client connections. (Yugo Nagata)
     </para>
    </listitem>
 
diff --git a/doc/src/sgml/release-3.4.sgml b/doc/src/sgml/release-3.4.sgml
index 82dc781..938534a 100644
--- a/doc/src/sgml/release-3.4.sgml
+++ b/doc/src/sgml/release-3.4.sgml
@@ -239,7 +239,7 @@
      (<ulink url="http://www.pgpool.net/mantisbt/view.php?id=487">bug 487</>) (Bo Peng)
     </para>
     <para>
-     When all backend nodes are down, <productname>Pgpool-II</> throws an uncorrect
+     When all backend nodes are down, <productname>Pgpool-II</> throws an incorrect
      error message "ERROR: connection cache is full". Change the error
      message to "all backend nodes are down, pgpool requires at least one valid node".
     </para>
@@ -474,7 +474,7 @@
     </para>
     <para>
      If order of startup packet's parameters differ between cached connection
-     pools and connection request, did't use connection pool ,and created new
+     pools and connection request, didn't use connection pool ,and created new
      connection pool.
     </para>
    </listitem>
@@ -635,7 +635,7 @@
     </para>
     <para>
      In a explicit transaction, the <literal>SELECT</literal> results are cached in temporary buffer.
-     If a write <acronym>SQL</acronym> is sent which modifies the table, the temporary buffe should be reset.
+     If a write <acronym>SQL</acronym> is sent which modifies the table, the temporary buffer should be reset.
     </para>
    </listitem>
 
@@ -979,7 +979,7 @@
      Change the <filename>pgpool.service</filename> and sysconfig files to output <productname>Pgpool-II</productname> log. (Bo Peng)
     </para>
     <para>
-     Removeing "Type=forking" and add OPTS=" -n" to
+     Removing "Type=forking" and add OPTS=" -n" to
      run <productname>Pgpool-II</productname> with non-daemon mode, because we need to redirect logs.
      Using <command>"journalctl"</command> command to see <productname>Pgpool-II</productname> systemd log.
     </para>
@@ -1013,7 +1013,7 @@
      frontend. In most cases this is good. However if other than primary
      node or master node returns an error state (this could happen if load
      balance node is other than primary or master node and the query is an
-     errornous SELECT), this should be returned to frontend, because the
+     erroneous SELECT), this should be returned to frontend, because the
      frontend already received an error.
     </para>
    </listitem>
@@ -1072,7 +1072,7 @@
      Fix bug mistakenly overriding global backend status right after failover. (Tatsuo Ishii)
     </para>
     <para>
-     See <ulink url="http://www.sraoss.jp/pipermail/pgpool-general/2017-September/005786.html">[pgpool-general: 5728]</ulink> for mor details.
+     See <ulink url="http://www.sraoss.jp/pipermail/pgpool-general/2017-September/005786.html">[pgpool-general: 5728]</ulink> for more details.
     </para>
    </listitem>
 
@@ -1326,7 +1326,7 @@
     2017-03-24 [1172e6c]
     -->
     <para>
-     Fix for 0000296: PGPool v3.6.2 terminated by systemd because the service Type has been set to 'forking'.
+     Fix for 0000296: Pgpool v3.6.2 terminated by systemd because the service Type has been set to 'forking'.
      <ulink url="http://www.pgpool.net/mantisbt/view.php?id=296">(Bug 296)</ulink> (Muhammad Usama)
     </para>
    </listitem>
@@ -1385,7 +1385,7 @@
     </para>
 
     <para>
-     This status mismatch should be fixe by pcp_promote_node, but when the node
+     This status mismatch should be fixed by pcp_promote_node, but when the node
      is the master node (the first alive node), it fails as mentioned above.
     </para>
 
@@ -1572,7 +1572,7 @@
     2016-12-28 [afebadf]
     -->
     <para>
-     Fix authentication timeout that can occur right after client connecttions. (Yugo Nagata)
+     Fix authentication timeout that can occur right after client connections. (Yugo Nagata)
     </para>
    </listitem>
 
diff --git a/doc/src/sgml/release-3.5.sgml b/doc/src/sgml/release-3.5.sgml
index cb4eec9..d8bad63 100644
--- a/doc/src/sgml/release-3.5.sgml
+++ b/doc/src/sgml/release-3.5.sgml
@@ -16,7 +16,7 @@
     2020-01-28 [d60e6b7]
     -->
     <para>
-     Check if socket file exists at startup and remove them if PID file doesn't exist to avoid bind() failire. (Bo Peng)
+     Check if socket file exists at startup and remove them if PID file doesn't exist to avoid bind() failure. (Bo Peng)
     </para>
    </listitem>
   </itemizedlist>
@@ -262,7 +262,7 @@
     2019-07-03 [380d8a5]
     -->
     <para>
-     Fix sefault when query cache is enabled. (<ulink url="https://www.pgpool.net/mantisbt/view.php?id=525">bug 525</ulink>) (Tatsuo Ishii)
+     Fix segfault when query cache is enabled. (<ulink url="https://www.pgpool.net/mantisbt/view.php?id=525">bug 525</ulink>) (Tatsuo Ishii)
     </para>
    </listitem>
 
@@ -376,7 +376,7 @@
      (<ulink url="http://www.pgpool.net/mantisbt/view.php?id=487">bug 487</>) (Bo Peng)
     </para>
     <para>
-     When all backend nodes are down, <productname>Pgpool-II</> throws an uncorrect
+     When all backend nodes are down, <productname>Pgpool-II</> throws an incorrect
      error message "ERROR: connection cache is full". Change the error
      message to "all backend nodes are down, pgpool requires at least one valid node".
     </para>
@@ -654,7 +654,7 @@
     </para>
     <para>
      If order of startup packet's  parameters differ between cached connection
-     pools and connection request, did't use connection pool ,and created new
+     pools and connection request, didn't use connection pool ,and created new
      connection pool.
     </para>
    </listitem>
@@ -859,7 +859,7 @@
     </para>
     <para>
      In a explicit transaction, the <literal>SELECT</literal> results are cached in temporary buffer.
-     If a write <acronym>SQL</acronym> is sent which modifies the table, the temporary buffe should be reset.
+     If a write <acronym>SQL</acronym> is sent which modifies the table, the temporary buffer should be reset.
     </para>
    </listitem>
 
@@ -1298,7 +1298,7 @@
      Change the <filename>pgpool.service</filename> and sysconfig files to output <productname>Pgpool-II</productname> log. (Bo Peng)
     </para>
     <para>
-     Removeing "Type=forking" and add OPTS=" -n" to
+     Removing "Type=forking" and add OPTS=" -n" to
      run <productname>Pgpool-II</productname> with non-daemon mode, because we need to redirect logs.
      Using <command>"journalctl"</command> command to see <productname>Pgpool-II</productname> systemd log.
     </para>
@@ -1384,7 +1384,7 @@
      frontend. In most cases this is good. However if other than primary
      node or master node returns an error state (this could happen if load
      balance node is other than primary or master node and the query is an
-     errornous SELECT), this should be returned to frontend, because the
+     erroneous SELECT), this should be returned to frontend, because the
      frontend already received an error.
     </para>
    </listitem>
@@ -1497,7 +1497,7 @@
      Fix bug mistakenly overriding global backend status right after failover. (Tatsuo Ishii)
     </para>
     <para>
-     See <ulink url="http://www.sraoss.jp/pipermail/pgpool-general/2017-September/005786.html">[pgpool-general: 5728]</ulink> for mor details.
+     See <ulink url="http://www.sraoss.jp/pipermail/pgpool-general/2017-September/005786.html">[pgpool-general: 5728]</ulink> for more details.
     </para>
    </listitem>
 
@@ -1558,7 +1558,7 @@
     2017-09-01 [ad90886]
     -->
     <para>
-     Fix <varname>wd_authkey</varname> bug in that a request to add new node to the clusetr is rejected by master. (Yugo Nagata)
+     Fix <varname>wd_authkey</varname> bug in that a request to add new node to the cluster is rejected by master. (Yugo Nagata)
     </para>
     <para>
      This is a bug due to the implementation of 3.5.6 and 3.6.3.
@@ -1850,10 +1850,10 @@
     2017-06-09 [b86e7b7]
     -->
     <para>
-     Fix a posible hang with streaming replication and extended protocol (Yugo Nagata)
+     Fix a possible hang with streaming replication and extended protocol (Yugo Nagata)
     </para>
     <para>
-     This hang occured under a certain condition. The following is an example.
+     This hang occurred under a certain condition. The following is an example.
     </para>
 
     <programlisting>
@@ -1864,7 +1864,7 @@
     </programlisting>
 
     <para>
-     Without using <productname>JDBC</productname>, we can reproduce the problem by <productname>pgproto</productname> with the followeing messages.
+     Without using <productname>JDBC</productname>, we can reproduce the problem by <productname>pgproto</productname> with the following messages.
     </para>
 
     <programlisting>
@@ -2271,7 +2271,7 @@
     2017-03-24 [d726c3a]
     -->
     <para>
-     Fix for 0000296: PGPool v3.6.2 terminated by systemd because the service Type has been set to 'forking'.
+     Fix for 0000296: Pgpool v3.6.2 terminated by systemd because the service Type has been set to 'forking'.
      <ulink url="http://www.pgpool.net/mantisbt/view.php?id=296">(Bug 296)</ulink> (Muhammad Usama)
     </para>
    </listitem>
@@ -2330,7 +2330,7 @@
     </para>
 
     <para>
-     This status mismatch should be fixe by pcp_promote_node, but when the node
+     This status mismatch should be fixed by pcp_promote_node, but when the node
      is the master node (the first alive node), it fails as mentioned above.
     </para>
 
@@ -2584,7 +2584,7 @@
     2016-12-28 [afebadf]
     -->
     <para>
-     Fix authentication timeout that can occur right after client connecttions. (Yugo Nagata)
+     Fix authentication timeout that can occur right after client connections. (Yugo Nagata)
     </para>
    </listitem>
 
@@ -2689,7 +2689,7 @@
       </listitem>
       <listitem>
        <para>
-	Pgool-II forward it to backend 1
+	Pgpool-II forward it to backend 1
        </para>
       </listitem>
       <listitem>
@@ -2699,7 +2699,7 @@
       </listitem>
       <listitem>
        <para>
-	Pgool-II forward it to backend 0 & 1
+	Pgpool-II forward it to backend 0 & 1
        </para>
       </listitem>
       <listitem>
@@ -2709,7 +2709,7 @@
       </listitem>
       <listitem>
        <para>
-	Pgool-II forward it to backend 0 & 1
+	Pgpool-II forward it to backend 0 & 1
        </para>
       </listitem>
       <listitem>
diff --git a/doc/src/sgml/release-3.6.sgml b/doc/src/sgml/release-3.6.sgml
index 4633c27..a3c8b37 100644
--- a/doc/src/sgml/release-3.6.sgml
+++ b/doc/src/sgml/release-3.6.sgml
@@ -16,7 +16,7 @@
     2020-01-28 [d60e6b7]
     -->
     <para>
-     Check if socket file exists at startup and remove them if PID file doesn't exist to avoid bind() failire. (Bo Peng)
+     Check if socket file exists at startup and remove them if PID file doesn't exist to avoid bind() failure. (Bo Peng)
     </para>
    </listitem>
   </itemizedlist>
@@ -337,7 +337,7 @@
     2019-07-03 [380d8a5]
     -->
     <para>
-     Fix sefault when query cache is enabled. (<ulink url="https://www.pgpool.net/mantisbt/view.php?id=525">bug 525</ulink>) (Tatsuo Ishii)
+     Fix segfault when query cache is enabled. (<ulink url="https://www.pgpool.net/mantisbt/view.php?id=525">bug 525</ulink>) (Tatsuo Ishii)
     </para>
    </listitem>
 
@@ -490,7 +490,7 @@
      (<ulink url="http://www.pgpool.net/mantisbt/view.php?id=487">bug 487</>) (Bo Peng)
     </para>
     <para>
-     When all backend nodes are down, <productname>Pgpool-II</> throws an uncorrect
+     When all backend nodes are down, <productname>Pgpool-II</> throws an incorrect
      error message "ERROR: connection cache is full". Change the error
      message to "all backend nodes are down, pgpool requires at least one valid node".
     </para>
@@ -828,7 +828,7 @@
     </para>
     <para>
      If order of startup packet's  parameters differ between cached connection
-     pools and connection request, did't use connection pool ,and created new
+     pools and connection request, didn't use connection pool ,and created new
      connection pool.
     </para>
    </listitem>
@@ -1070,7 +1070,7 @@
     </para>
     <para>
      In a explicit transaction, the <literal>SELECT</literal> results are cached in temporary buffer.
-     If a write <acronym>SQL</acronym> is sent which modifies the table, the temporary buffe should be reset.
+     If a write <acronym>SQL</acronym> is sent which modifies the table, the temporary buffer should be reset.
     </para>
    </listitem>
 
@@ -1675,7 +1675,7 @@
      Change the <filename>pgpool.service</filename> and sysconfig files to output <productname>Pgpool-II</productname> log. (Bo Peng)
     </para>
     <para>
-     Removeing "Type=forking" and add OPTS=" -n" to
+     Removing "Type=forking" and add OPTS=" -n" to
      run <productname>Pgpool-II</productname> with non-daemon mode, because we need to redirect logs.
      Using <command>"journalctl"</command> command to see <productname>Pgpool-II</productname> systemd log.
     </para>
@@ -1785,7 +1785,7 @@
      frontend. In most cases this is good. However if other than primary
      node or master node returns an error state (this could happen if load
      balance node is other than primary or master node and the query is an
-     errornous SELECT), this should be returned to frontend, because the
+     erroneous SELECT), this should be returned to frontend, because the
      frontend already received an error.
     </para>
    </listitem>
@@ -1907,7 +1907,7 @@
      Fix bug mistakenly overriding global backend status right after failover. (Tatsuo Ishii)
     </para>
     <para>
-     See <ulink url="http://www.sraoss.jp/pipermail/pgpool-general/2017-September/005786.html">[pgpool-general: 5728]</ulink> for mor details.
+     See <ulink url="http://www.sraoss.jp/pipermail/pgpool-general/2017-September/005786.html">[pgpool-general: 5728]</ulink> for more details.
     </para>
    </listitem>
 
@@ -1977,7 +1977,7 @@
     2017-09-01 [b661a8b]
     -->
     <para>
-     Fix <varname>wd_authkey</varname> bug in that a request to add new node to the clusetr is rejected by master. (Yugo Nagata)
+     Fix <varname>wd_authkey</varname> bug in that a request to add new node to the cluster is rejected by master. (Yugo Nagata)
     </para>
     <para>
      This is a bug due to the implementation of 3.5.6 and 3.6.3.
@@ -2203,7 +2203,7 @@
     2017-08-21 [1812a84]
     -->
     <para>
-     Doc: Add new English and Japanese documents of <link linkend="example-cluster">Pgpoo-II + Watchdog Setup Example</link>. (Bo Peng)
+     Doc: Add new English and Japanese documents of <link linkend="example-cluster">Pgpool-II + Watchdog Setup Example</link>. (Bo Peng)
     </para>
    </listitem>
 
@@ -2289,11 +2289,11 @@
     2017-06-09 [d9b0b83]
     -->
     <para>
-     Fix a posible hang with streaming replication and extended protocol. (Yugo Nagata)
+     Fix a possible hang with streaming replication and extended protocol. (Yugo Nagata)
     </para>
 
     <para>
-     This hang occured under a certain condition. The following is an example.
+     This hang occurred under a certain condition. The following is an example.
     </para>
 
     <programlisting>
@@ -2304,7 +2304,7 @@
     </programlisting>
 
     <para>
-     Without using <productname>JDBC</productname>, we can reproduce the problem by <productname>pgproto</productname> with the followeing messages.
+     Without using <productname>JDBC</productname>, we can reproduce the problem by <productname>pgproto</productname> with the following messages.
     </para>
 
     <programlisting>
@@ -2587,7 +2587,7 @@
     2017-04-14 [50fb9a4]
     -->
     <para>
-     Removing the function defined but not used warnings from pool_config_vatiable.c (Muhammad Usama)
+     Removing the function defined but not used warnings from pool_config_variable.c (Muhammad Usama)
     </para>
    </listitem>
 
@@ -2843,7 +2843,7 @@
     2017-03-24 [c2a0cc5]
     -->
     <para>
-     Fix for 0000296: PGPool v3.6.2 terminated by systemd because the service Type has been set to 'forking'.
+     Fix for 0000296: Pgpool v3.6.2 terminated by systemd because the service Type has been set to 'forking'.
      <ulink url="http://www.pgpool.net/mantisbt/view.php?id=296">(Bug 296)</ulink> (Muhammad Usama)
     </para>
    </listitem>
@@ -2903,7 +2903,7 @@
     </para>
 
     <para>
-     This status mismatch should be fixe by pcp_promote_node, but when the node
+     This status mismatch should be fixed by pcp_promote_node, but when the node
      is the master node (the first alive node), it fails as mentioned above.
     </para>
 
@@ -3158,7 +3158,7 @@
     2016-12-28 [afebadf]
     -->
     <para>
-     Fix authentication timeout that can occur right after client connecttions. (Yugo Nagata)
+     Fix authentication timeout that can occur right after client connections. (Yugo Nagata)
     </para>
    </listitem>
 
@@ -3261,7 +3261,7 @@
       </listitem>
       <listitem>
        <para>
-	Pgool-II forward it to backend 1
+	Pgpool-II forward it to backend 1
        </para>
       </listitem>
       <listitem>
@@ -3271,7 +3271,7 @@
       </listitem>
       <listitem>
        <para>
-	Pgool-II forward it to backend 0 & 1
+	Pgpool-II forward it to backend 0 & 1
        </para>
       </listitem>
       <listitem>
@@ -3281,7 +3281,7 @@
       </listitem>
       <listitem>
        <para>
-	Pgool-II forward it to backend 0 & 1
+	Pgpool-II forward it to backend 0 & 1
        </para>
       </listitem>
       <listitem>
@@ -3557,7 +3557,7 @@
     restart. Watchdog not syncing status.
     -->
     <para>
-     Sync inconsitent status
+     Sync inconsistent status
      of <productname>PostgreSQL</productname> nodes
      in <productname>Pgpool-II</productname> instances after
      restart. (bug 218) (Muhammad Usama)
@@ -3691,7 +3691,7 @@
     2016-08-18 [d3211dc] Let watchdog_setup to be installed.
     -->
     <para>
-     Add new script called "watchdog_setup". (Tatstuo Ishii)
+     Add new script called "watchdog_setup". (Tatsuo Ishii)
     </para>
     <para>
      <xref linkend="WATCHDOG-SETUP"> is a command to create a
@@ -3742,7 +3742,7 @@
      Do not update status file if all backend nodes are in down status. (Chris Pacejo, Tatsuo Ishii)
     </para>
     <para>
-     This commit tries to remove the data inconsitency in
+     This commit tries to remove the data inconsistency in
      replication mode found
      in <ulink url="http://www.pgpool.net/pipermail/pgpool-general/2015-August/003974.html">[pgpool-general:
       3918]</ulink> by not recording the status file when all
@@ -3839,7 +3839,7 @@
     -->
     <para>
      Change the default value of
-     <xref linkend="guc-search-primary-node-timeout"> from 10 to 300. (Tatstuo Ishii)
+     <xref linkend="guc-search-primary-node-timeout"> from 10 to 300. (Tatsuo Ishii)
     </para>
     <para>
      Prior default value 10 seconds is sometimes too short for a standby to
@@ -4081,10 +4081,10 @@
    </listitem>
    <listitem>
     <!--
-    2016-08-01 [024eaea]  Fix for 215: pgpool doesnt escalate ip in case of another node inavailability
+    2016-08-01 [024eaea]  Fix for 215: pgpool doesnt escalate ip in case of another node unavailability
     -->
     <para>
-     Fix <productname>Pgpool-II</productname> doesn't escalate ip in case of another node inavailability. (bug 215) (Muhammad Usama)
+     Fix <productname>Pgpool-II</productname> doesn't escalate ip in case of another node unavailability. (bug 215) (Muhammad Usama)
     </para>
     <para>
      The heartbeat receiver fails to identify the heartbeat sender watchdog node when
@@ -4260,16 +4260,16 @@
    </listitem>
    <listitem>
     <!--
-    2016-06-08 [294cf4a]  Fix a posible hang during health checking
+    2016-06-08 [294cf4a]  Fix a possible hang during health checking
     -->
     <para>
-     Fix a posible hang during health checking. (bug 204) (Yugo Nagata)
+     Fix a possible hang during health checking. (bug 204) (Yugo Nagata)
     </para>
     <para>
-     Helath checking was hang when any data wasn't sent
+     Health checking was hang when any data wasn't sent
      from backend after <function>connect(2)</function> succeeded. To fix this,
      <function>pool_check_fd()</function> returns 1 when <function>select(2)</function> exits with
-     EINTR due to SIGALRM while health checkking is performed.
+     EINTR due to SIGALRM while health checking is performed.
     </para>
    </listitem>
    <listitem>
@@ -4348,13 +4348,13 @@
    </listitem>
    <listitem>
     <!--
-    2016-05-11 [de905f6]  Fix documetation bug about raw mode
+    2016-05-11 [de905f6]  Fix documentation bug about raw mode
     -->
     <para>
-     Fix  Japanese and Chinese documetation bug about raw mode. (Yugo Nagata, Bo Peng)
+     Fix  Japanese and Chinese documentation bug about raw mode. (Yugo Nagata, Bo Peng)
     </para>
     <para>
-     Connection pool is avalilable in raw mode.
+     Connection pool is available in raw mode.
     </para>
    </listitem>
    <listitem>
@@ -4464,7 +4464,7 @@
      Fix pgpool hung after receiving error state from backend. (bug #169) (Tatsuo Ishii)
     </para>
     <para>
-     This could happend if we execute an extended protocol query and it
+     This could happen if we execute an extended protocol query and it
      fails.
     </para>
    </listitem>
@@ -4473,7 +4473,7 @@
     2016-03-03 [bb295a2]  Fix query stack problems in extended protocol case.
     -->
     <para>
-     Fix query stack problems in extended protocol case. (bug 167, 168) (Tatstuo Ishii)
+     Fix query stack problems in extended protocol case. (bug 167, 168) (Tatsuo Ishii)
     </para>
     <para>
     </para>
@@ -4520,10 +4520,10 @@
    </listitem>
    <listitem>
     <!--
-    2016-02-03 [48e9d4b]  Fix for [pgpool-II 0000166]: compile issue on freebsd
+    2016-02-03 [48e9d4b]  Fix for [pgpool-II 0000166]: compile issue on FreeBSD
     -->
     <para>
-     Fix compile issue on freebsd. (Muhammad Usama)
+     Fix compile issue on FreeBSD. (Muhammad Usama)
     </para>
     <para>
      Add missing include files. The patch is contributed by
@@ -4547,7 +4547,7 @@
     </para>
     <para>
      Sometimes <xref linkend="guc-wd-authkey"> calculation fails for some reason other than
-      authkey mismatch. The additional messages make these distingushable
+      authkey mismatch. The additional messages make these distinguishable
       for each other.
     </para>
    </listitem>
diff --git a/doc/src/sgml/release-3.7.sgml b/doc/src/sgml/release-3.7.sgml
index deebc88..452d62c 100644
--- a/doc/src/sgml/release-3.7.sgml
+++ b/doc/src/sgml/release-3.7.sgml
@@ -35,7 +35,7 @@
     2020-01-28 [abbba81]
     -->
     <para>
-     Check if socket file exists at startup and remove them if PID file doesn't exist to avoid bind() failire. (Bo Peng)
+     Check if socket file exists at startup and remove them if PID file doesn't exist to avoid bind() failure. (Bo Peng)
     </para>
    </listitem>
   </itemizedlist>
@@ -262,7 +262,7 @@
     2019-09-04 [3ba4e73]
     -->
     <para>
-     Doc: mention that VIP will not be brougt up if quorum does not exist. (Tatsuo Ishii)
+     Doc: mention that VIP will not be brought up if quorum does not exist. (Tatsuo Ishii)
     </para>
     <para>
      
@@ -467,7 +467,7 @@
     2019-07-03 [380d8a5]
     -->
     <para>
-     Fix sefault when query cache is enabled. (<ulink url="https://www.pgpool.net/mantisbt/view.php?id=525">bug 525</ulink>) (Tatsuo Ishii)
+     Fix segfault when query cache is enabled. (<ulink url="https://www.pgpool.net/mantisbt/view.php?id=525">bug 525</ulink>) (Tatsuo Ishii)
     </para>
    </listitem>
 
@@ -631,7 +631,7 @@
      (<ulink url="http://www.pgpool.net/mantisbt/view.php?id=487">bug 487</>) (Bo Peng)
     </para>
     <para>
-     When all backend nodes are down, <productname>Pgpool-II</> throws an uncorrect
+     When all backend nodes are down, <productname>Pgpool-II</> throws an incorrect
      error message "ERROR: connection cache is full". Change the error
      message to "all backend nodes are down, pgpool requires at least one valid node".
     </para>
@@ -996,7 +996,7 @@
     </para>
     <para>
      If order of startup packet's  parameters differ between cached connection
-     pools and connection request, did't use connection pool ,and created new
+     pools and connection request, didn't use connection pool ,and created new
      connection pool.
     </para>
    </listitem>
@@ -1237,7 +1237,7 @@
     </para>
     <para>
      In a explicit transaction, the <literal>SELECT</literal> results are cached in temporary buffer.
-     If a write <acronym>SQL</acronym> is sent which modifies the table, the temporary buffe should be reset.
+     If a write <acronym>SQL</acronym> is sent which modifies the table, the temporary buffer should be reset.
     </para>
    </listitem>
 
@@ -2085,7 +2085,7 @@
      Change the <filename>pgpool.service</filename> and sysconfig files to output <productname>Pgpool-II</productname> log. (Bo Peng)
     </para>
     <para>
-     Removeing "Type=forking" and add OPTS=" -n" to
+     Removing "Type=forking" and add OPTS=" -n" to
      run <productname>Pgpool-II</productname> with non-daemon mode, because we need to redirect logs.
      Using <command>"journalctl"</command> command to see <productname>Pgpool-II</productname> systemd log.
     </para>
@@ -2225,7 +2225,7 @@
      frontend. In most cases this is good. However if other than primary
      node or master node returns an error state (this could happen if load
      balance node is other than primary or master node and the query is an
-     errornous SELECT), this should be returned to frontend, because the
+     erroneous SELECT), this should be returned to frontend, because the
      frontend already received an error.
     </para>
    </listitem>
@@ -2587,7 +2587,7 @@
     2017-09-19 [34922b5]
     -->
     <para>
-     Test: Add new test 011.watchdoc_quorum_failover. (Tatsuo Ishii)
+     Test: Add new test 011.watchdog_quorum_failover. (Tatsuo Ishii)
     </para>
    </listitem>
 
diff --git a/doc/src/sgml/release-4.0.sgml b/doc/src/sgml/release-4.0.sgml
index a92285b..818ec8a 100644
--- a/doc/src/sgml/release-4.0.sgml
+++ b/doc/src/sgml/release-4.0.sgml
@@ -35,7 +35,7 @@
     2020-01-28 [304e091]
     -->
     <para>
-     Check if socket file exists at startup and remove them if PID file doesn't exist to avoid bind() failire. (Bo Peng)
+     Check if socket file exists at startup and remove them if PID file doesn't exist to avoid bind() failure. (Bo Peng)
     </para>
    </listitem>
   </itemizedlist>
@@ -93,7 +93,7 @@
     2020-01-28 [f8bbd91]
     -->
     <para>
-     Doc: Change the sample follow_master_command script %M %H paramater's order. (Bo Peng)
+     Doc: Change the sample follow_master_command script %M %H parameter's order. (Bo Peng)
     </para>
     <para>
      
@@ -303,7 +303,7 @@
     2019-09-04 [3ba4e73]
     -->
     <para>
-     Doc: mention that VIP will not be brougt up if quorum does not exist. (Tatsuo Ishii)
+     Doc: mention that VIP will not be brought up if quorum does not exist. (Tatsuo Ishii)
     </para>
     <para>
      
@@ -550,7 +550,7 @@
     2019-07-03 [5d042e4]
     -->
     <para>
-     Fix sefault when query cache is enabled. (<ulink url="https://www.pgpool.net/mantisbt/view.php?id=525">bug 525</ulink>) (Tatsuo Ishii)
+     Fix segfault when query cache is enabled. (<ulink url="https://www.pgpool.net/mantisbt/view.php?id=525">bug 525</ulink>) (Tatsuo Ishii)
     </para>
    </listitem>
 
@@ -1337,7 +1337,7 @@
  <sect2>
   <title>Overview</title>
   <para>
-   This version addes support for SCRAM and CERT authentication,
+   This version adds support for SCRAM and CERT authentication,
    improves load balancing control and import PostgreSQL 11 
    new SQL parser. 
   </para>
diff --git a/doc/src/sgml/release-4.1.sgml b/doc/src/sgml/release-4.1.sgml
index 20c735b..54c5256 100644
--- a/doc/src/sgml/release-4.1.sgml
+++ b/doc/src/sgml/release-4.1.sgml
@@ -35,7 +35,7 @@
     2020-01-28 [b0b52ef]
     -->
     <para>
-     Check if socket file exists at startup and remove them if PID file doesn't exist to avoid bind() failire. (Bo Peng)
+     Check if socket file exists at startup and remove them if PID file doesn't exist to avoid bind() failure. (Bo Peng)
     </para>
    </listitem>
   </itemizedlist>
@@ -114,7 +114,7 @@
     2020-01-10 [d0252d8]
     -->
     <para>
-     Doc: Change the sample follow_master_command script %M %H paramater's order. (Bo Peng)
+     Doc: Change the sample follow_master_command script %M %H parameter's order. (Bo Peng)
     </para>
    </listitem>
 
@@ -301,7 +301,7 @@
     <para>
      Add parameter <xref
      linkend="guc-enable-consensus-with-half-votes"> to configure
-     majority rule calculations. (Muhammd Usama, Tatsuo Ishii)
+     majority rule calculations. (Muhammad Usama, Tatsuo Ishii)
     </para>
     <para>
      This changes the behavior of the decision of quorum existence and
@@ -310,7 +310,7 @@
      affected. When this parameter is off (the default), a 2 node
      watchdog cluster needs to have both 2 nodes are alive to have a
      quorum. If the quorum does not exist and 1 node goes down, then
-     1) VIP will be lost, 2) failover srcript is not executed and 3)
+     1) VIP will be lost, 2) failover script is not executed and 3)
      no watchdog master exists. Especially #2 could be troublesome
      because no new primary <productname>PostgreSQL</productname>
      exists if existing primary goes down. Probably 2 node watchdog
@@ -486,7 +486,7 @@
     -->
     <para>
      Performance enhancements for the large INSERT and UPDATE
-     statements. (Muhammd Usama)
+     statements. (Muhammad Usama)
     </para>
     <para>
      <productname>Pgpool-II</productname> only needs very little
@@ -529,7 +529,7 @@
      Import PostgreSQL 12 beta2 new parser. (Bo Peng)
     </para>
     <para>
-     Major chanegs of PostgreSQL 12 parser include:
+     Major changes of PostgreSQL 12 parser include:
 
      <itemizedlist>
       <listitem>
@@ -607,7 +607,7 @@
      we set <xref linkend="guc-disable-load-balance-on-write"> =
       <literal>transaction</literal>, when a write query is issued
       inside an explicit truncation, subsequent queries should be
-      sent to primary only until the end of this transactionin in
+      sent to primary only until the end of this transaction in
       order to avoid the replication delay.  However, the SELECTs
       having write functions specified
       in <xref linkend="guc-black-function-list"> or not specified
@@ -810,7 +810,7 @@
     -->
     <para>
      Resign the master watchdog node from master responsibilities if
-     the primary backend node gets into quarantine state on that. (Muhammd Usama)
+     the primary backend node gets into quarantine state on that. (Muhammad Usama)
     </para>
     <para>
      By doing this, we could avoid the situation on which there's no
@@ -841,7 +841,7 @@
     <para>
      Add parameter <xref
      linkend="guc-enable-consensus-with-half-votes"> to configure
-     majority rule calculations. (Muhammd Usama, Tatsuo Ishii)
+     majority rule calculations. (Muhammad Usama, Tatsuo Ishii)
     </para>
     <para>
      <productname>Pgpool-II</productname> takes the decision of quorum
@@ -939,8 +939,7 @@
       <listitem>
        <para>
 	Mention that schema qualifications cannot be used in
-	Add performance chapterwhite/black_function_list. (tatsuo
-	Ishii)
+	white/black_function_list. (tatsuo Ishii)
        </para>
       </listitem>
 
diff --git a/doc/src/sgml/ssl.sgml b/doc/src/sgml/ssl.sgml
index c7a2693..0800d15 100644
--- a/doc/src/sgml/ssl.sgml
+++ b/doc/src/sgml/ssl.sgml
@@ -1,7 +1,7 @@
 <!-- doc/src/sgml/config.sgml -->
 
 <sect1 id="runtime-ssl">
- <title>Secure Sockect Layer (SSL)</title>
+ <title>Secure Socket Layer (SSL)</title>
 
  <sect2 id="runtime-config-ssl-settings">
 
@@ -208,7 +208,7 @@
     <listitem>
      <para>
       Specifies the name of the file containing Diffie-Hellman parameters
-      used for so-called ephemeral DH family of SSl ciphers. The default is
+      used for so-called ephemeral DH family of SSL ciphers. The default is
       empty. In which case compiled-in default DH parameters used. Using
       Custom DH parameters reduces the exposure if an attacker manages to
       crack the well-known compiled-in DH parameters. You can create your own
diff --git a/doc/src/sgml/start.sgml b/doc/src/sgml/start.sgml
index 7e6a595..9ca51ba 100644
--- a/doc/src/sgml/start.sgml
+++ b/doc/src/sgml/start.sgml
@@ -30,7 +30,7 @@
   <para>
    Before going further, you should properly set
    up <filename>pgpool.conf</filename> with streaming replication
-   mode. Sample configulations are provided with
+   mode. Sample configurations are provided with
    <productname>Pgpool-II</productname>, there configuration file
    are located at /usr/local/etc with default installation from
    source code. you can copy
@@ -335,7 +335,7 @@
     installation. The argument -p is to specify the port number
     assigned to the command, which is 11001 set
     by <command>pgpool_setup</command>. The argument -n is to
-    specify the node id to be receovered. After executing the command,
+    specify the node id to be recovered. After executing the command,
     node 0 returned to "up" status.
   </para>
   <para>
@@ -435,7 +435,7 @@
   </para>
   <para>
    <figure>
-    <title>Process architecure of <productname>Pgpool-II</productname></title>
+    <title>Process architecture of <productname>Pgpool-II</productname></title>
     <mediaobject>
      <imageobject>
       <imagedata fileref="process-diagram.gif">
diff --git a/doc/src/sgml/stream-check.sgml b/doc/src/sgml/stream-check.sgml
index 9bbd9b1..5eaf45d 100644
--- a/doc/src/sgml/stream-check.sgml
+++ b/doc/src/sgml/stream-check.sgml
@@ -193,7 +193,7 @@
     </para>
 
     <para>
-     This parameter can be changed by reloading the <productname>Pgpool-II conf</>igurations.
+     This parameter can be changed by reloading the <productname>Pgpool-II</>configurations.
     </para>
 
    </listitem>
diff --git a/doc/src/sgml/watchdog.sgml b/doc/src/sgml/watchdog.sgml
index f46e73d..b7da5e8 100644
--- a/doc/src/sgml/watchdog.sgml
+++ b/doc/src/sgml/watchdog.sgml
@@ -309,7 +309,7 @@
  </sect2>
 
  <sect2 id="config-watchdog-escalation-de-escalation">
-  <title>Behaivor on escalation and de-escalation</title>
+  <title>Behaviour on escalation and de-escalation</title>
 
   <para>
    Configuration about behavior when <productname>Pgpool-II</productname>
@@ -327,8 +327,8 @@
     <listitem>
      <para>
       When set to on, watchdog clears all the query cache in the shared memory
-      when pgpool-II escaltes to active. This prevents the new active <productname>Pgpool-II</productname>
-      from using old query caches inconsistence to the old active.
+      when pgpool-II escalates to active. This prevents the new active <productname>Pgpool-II</productname>
+      from using old query caches inconsistent to the old active.
      </para>
      <para>
       Default is on.
@@ -488,7 +488,7 @@
       automatically re-attached.
      </para>
      <para>
-      From <productname>Pgpool-II </productname><emphasis>V4.1</emphasis> onwards, if the watchdog-master node
+      From <productname>Pgpool-II </productname><emphasis>V4.1</emphasis> onward, if the watchdog-master node
       fails to build the consensus for primary backend node failover and the primary backend node gets into a
       quarantine state, then it resigns from its master/coordinator responsibilities and lowers its wd_priority
       for next leader election and let the cluster elect some different new leader.