diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index afbb6c35e3..08c372db63 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -1012,9 +1012,9 @@ include_dir 'conf.d'
         the kernel reports that the connection is closed.
        </para>
        <para>
-        This option is currently available only on systems that support the
-        non-standard <symbol>POLLRDHUP</symbol> extension to the
-        <symbol>poll</symbol> system call, including Linux.
+        This option relies on kernel events exposed by Linux, macOS, illumos
+        and the BSD family of operating systems, and is not currently available
+        on other systems.
        </para>
        <para>
         If the value is specified without units, it is taken as milliseconds.
@@ -1035,6 +1035,25 @@ include_dir 'conf.d'
       </listitem>
      </varlistentry>
 
+     <varlistentry id="guc-remote-servers-connection-check-interval" xreflabel="remote_servers_connection_check_interval">
+      <term><varname>remote_servers_connection_check_interval</varname> (<type>integer</type>)
+      <indexterm>
+       <primary><varname>remote_servers_connection_check_interval</varname> configuration parameter</primary>
+      </indexterm>
+      </term>
+      <listitem>
+       <para>
+        Sets the time interval between optional checks that the remote servers
+        are still alive. If this parameter is set to a valid value, registered
+        callback functions are executed at the specified time interval.
+        If your FDW extension does not implement a callback function, nothing
+        happens after the specified amount of time. If the value is specified
+        without units, it is taken as milliseconds. The default value is
+        <literal>0</literal>, this means the feature is disabled.
+       </para>
+      </listitem>
+     </varlistentry>
+
      </variablelist>
      </sect2>
 
diff --git a/doc/src/sgml/fdwhandler.sgml b/doc/src/sgml/fdwhandler.sgml
index dbf5dd3d15..38e67730bf 100644
--- a/doc/src/sgml/fdwhandler.sgml
+++ b/doc/src/sgml/fdwhandler.sgml
@@ -2136,4 +2136,28 @@ GetForeignServerByName(const char *name, bool missing_ok);
 
   </sect1>
 
+   <sect1 id="fdw-checking-remote-servers">
+    <title>Checking the Health of Remote Servers via Foreign Data Wrapper</title>
+
+    <para>
+     For verifying the health of remote servers, callback functions can be
+     registered that runs periodically. The time interval is controlled by
+     <xref linkend="guc-remote-servers-connection-check-interval"/>.
+     The API for registering functions is:
+    <programlisting>
+void
+RegisterCheckingRemoteServersCallback(CheckingRemoteServersCallback callback, void *arg);
+    </programlisting>
+     Only functions that return void can be registered as callback functions.
+     Please set to void* arg a pointer if you want to pass an argument.
+     If you have problems with the health check results and want to
+     abort the transaction, please execute <function>ereport(ERROR)</function>
+     in the callback function.
+     Note that callback functions will be released at end of each transaction.
+     Please register callback functions every time you connect to remote servers.
+    </para>
+
+   </sect1>
+
+
  </chapter>