diff --git a/docs/PortKnocking.xml b/docs/PortKnocking.xml
index 530d4b2e1..85732e6a1 100644
--- a/docs/PortKnocking.xml
+++ b/docs/PortKnocking.xml
@@ -130,7 +130,7 @@ SSHKnock         net               loc:192.168.1.5 tcp         22            -
     </orderedlist>
   </section>
 
-  <section>
+  <section id="Limit">
     <title>Limiting Per-IP Connection Rate</title>
 
     <para>Beginning with Shorewall 3.0.4, Shorewall has a 'Limit' action.