diff --git a/docs/Shorewall-perl.xml b/docs/Shorewall-perl.xml
index b6fbad2dd..2d828a501 100644
--- a/docs/Shorewall-perl.xml
+++ b/docs/Shorewall-perl.xml
@@ -143,7 +143,7 @@
           </itemizedlist>
         </listitem>
 
-        <listitem id="Extension">
+        <listitem id="Extensions">
           <para>With the shell-based compiler, extension scripts were copied
           into the compiled script and executed at run-time. In many cases,
           this approach doesn't work with Shorewall Perl because (almost) the