diff --git a/Shorewall/manpages/shorewall.conf.xml b/Shorewall/manpages/shorewall.conf.xml
index e789478d9..04ec16732 100644
--- a/Shorewall/manpages/shorewall.conf.xml
+++ b/Shorewall/manpages/shorewall.conf.xml
@@ -1636,7 +1636,7 @@ LOG:info:,bar                        net                    fw</programlisting>
 
       <varlistentry>
         <term><emphasis
-        role="bold">MODULESDIR=</emphasis>[<emphasis>pathname</emphasis>[<emphasis
+        role="bold">MODULESDIR=</emphasis>[[+]<emphasis>pathname</emphasis>[<emphasis
         role="bold">:</emphasis><emphasis>pathname</emphasis>]...]</term>
 
         <listitem>
@@ -1647,6 +1647,10 @@ LOG:info:,bar                        net                    fw</programlisting>
           where <emphasis role="bold">uname</emphasis> holds the output of
           '<command>uname -r</command>' and <emphasis
           role="bold">g_family</emphasis> holds '4'.</para>
+
+          <para>The option plus sign ('+') was added in Shorewall 5.0.3 and
+          causes the listed pathnames to be appended to the default list
+          above.</para>
         </listitem>
       </varlistentry>
 
diff --git a/Shorewall6/manpages/shorewall6.conf.xml b/Shorewall6/manpages/shorewall6.conf.xml
index 168b40edd..e643d5050 100644
--- a/Shorewall6/manpages/shorewall6.conf.xml
+++ b/Shorewall6/manpages/shorewall6.conf.xml
@@ -1436,7 +1436,7 @@ LOG:info:,bar                        net                    fw</programlisting>
 
       <varlistentry>
         <term><emphasis
-        role="bold">MODULESDIR=</emphasis>[<emphasis>pathname</emphasis>[<emphasis
+        role="bold">MODULESDIR=</emphasis>[[+]<emphasis>pathname</emphasis>[<emphasis
         role="bold">:</emphasis><emphasis>pathname</emphasis>]...]</term>
 
         <listitem>
@@ -1447,6 +1447,10 @@ LOG:info:,bar                        net                    fw</programlisting>
           where <emphasis role="bold">uname</emphasis> holds the output of
           '<command>uname -r</command>' and <emphasis
           role="bold">g_family</emphasis> holds '6'.</para>
+
+          <para>The option plus sign ('+') was added in Shorewall 5.0.3 and
+          causes the listed pathnames to be appended to the default list
+          above.</para>
         </listitem>
       </varlistentry>