diff --git a/manual/Tasks/typedef.html b/manual/Tasks/typedef.html
index 7d0de52c3..de8686654 100644
--- a/manual/Tasks/typedef.html
+++ b/manual/Tasks/typedef.html
@@ -254,7 +254,14 @@
               classpath="path/to/ant-contrib.jar"/>
   </pre>
             
-  
+<p>Here the namespace
+  declaration <code>xmlns:antcontrib="antlib:net.sf.antcontrib"</code>
+  allows tasks and types of the AntContrib Antlib to be used with the
+  <code>antcontrib</code> prefix
+  like <code>&lt;antcontrib:if&gt;</code>.
+  The normal rules of XML namespaces apply and you can declare the
+  prefix at any element to make it usable for the element it is
+  declared on as well as all its child elements.</p>
 
 
 </body>