diff --git a/Shorewall/manpages/shorewall-rules.xml b/Shorewall/manpages/shorewall-rules.xml
index d001acd1c..91cff1f48 100644
--- a/Shorewall/manpages/shorewall-rules.xml
+++ b/Shorewall/manpages/shorewall-rules.xml
@@ -241,7 +241,7 @@
 
             <varlistentry>
               <term><emphasis
-              role="bold">ADD(<replaceable>ipset</replaceable>:<replaceable>flags</replaceable>)</emphasis></term>
+              role="bold">ADD(<replaceable>ipset</replaceable>:<replaceable>flags</replaceable>[:<replaceable>timeout</replaceable>])</emphasis></term>
 
               <listitem>
                 <para>Added in Shorewall 4.4.12. Causes addresses and/or port
@@ -256,6 +256,12 @@
                 role="bold">dst</emphasis> respectively (see the -A command in
                 ipset (8)).</para>
 
+                <para>Beginning with Shorewall 5.0.3, an optional
+                <replaceable>timeout</replaceable> can be specified. This is
+                the number of seconds that the new entry in the ipset is to
+                remain valid and overrides any timeout specified when the
+                ipset was created.</para>
+
                 <para>ADD is non-terminating. Even if a packet matches the
                 rule, it is passed on to the next rule.</para>
               </listitem>
diff --git a/Shorewall6/manpages/shorewall6-rules.xml b/Shorewall6/manpages/shorewall6-rules.xml
index 5d8b0a72b..85f750616 100644
--- a/Shorewall6/manpages/shorewall6-rules.xml
+++ b/Shorewall6/manpages/shorewall6-rules.xml
@@ -229,6 +229,12 @@
                 role="bold">dst</emphasis> respectively (see the -A command in
                 ipset (8)).</para>
 
+                <para>Beginning with Shorewall 5.0.3, an optional
+                <replaceable>timeout</replaceable> can be specified. This is
+                the number of seconds that the new entry in the ipset is to
+                remain valid and overrides any timeout specified when the
+                ipset was created.</para>
+
                 <para>ADD is non-terminating. Even if a packet matches the
                 rule, it is passed on to the next rule.</para>
               </listitem>