diff --git a/docs/Documentation.xml b/docs/Documentation.xml
index 949206f22..472ad51a0 100644
--- a/docs/Documentation.xml
+++ b/docs/Documentation.xml
@@ -4073,7 +4073,23 @@ all      all     tcp         ftp-data          -               8</programlisting
               hosts throughout '[re]start', 'stop' and 'clear'. Specifying
               'critical' on one or more entries will cause your firewall to be
               "totally open" for a brief window during each of those
-              operations.</para>
+              operations. Examples of where you might want to use this
+              are:</para>
+
+              <itemizedlist>
+                <listitem>
+                  <para>'Ping' nodes with heartbeat.</para>
+                </listitem>
+
+                <listitem>
+                  <para>LDAP server(s) if you use LDAP Authentication</para>
+                </listitem>
+
+                <listitem>
+                  <para>NFS Server if you have an NFS-mounted root
+                  filesystem.</para>
+                </listitem>
+              </itemizedlist>
             </listitem>
           </itemizedlist>
         </listitem>