diff --git a/doc/src/sgml/watchdog.sgml b/doc/src/sgml/watchdog.sgml
index 7e7adc91..c097e414 100644
--- a/doc/src/sgml/watchdog.sgml
+++ b/doc/src/sgml/watchdog.sgml
@@ -442,6 +442,18 @@
         <para>
           Default is on.
         </para>
+
+	<caution>
+	  <para>
+        When <varname>failover_require_consensus</varname> is enabled, <productname>Pgpool-II</productname>
+        does not executes the failover until it get enough votes from other <productname>Pgpool-II</productname>
+        nodes. So it is strongly recommended to enable the backend health check on all
+        <productname>Pgpool-II</productname> nodes to ensure proper detection of backend node failures.
+	    For more details of health check,
+	    see <xref linkend="runtime-config-health-check">.
+	  </para>
+	</caution>
+
         <para>
         <varname>failover_require_consensus</varname> is not available prior to
         <productname>Pgpool-II </productname><emphasis>V3.7</emphasis>. and it is only