diff --git a/docs/Events.xml b/docs/Events.xml
index f820b0c81..cf41ae00a 100644
--- a/docs/Events.xml
+++ b/docs/Events.xml
@@ -705,8 +705,9 @@ Knock                 net            $FW       tcp        22,1599-1601
     <section id="Stateful">
       <title>Stateful Port Knocking (knock with a sequence of ports)</title>
 
-      <para>Gerhard Wiesinger has contributed a Perl module that allows you to
-      define portknocking sequences. Download <ulink
+      <para><ulink url="http://www.wiesinger.com/">Gerhard Wiesinger</ulink>
+      has contributed a Perl module that allows you to define portknocking
+      sequences. Download <ulink
       url="pub/shorewall/contrib/PortKnocking/KnockEnhanced.pm">the
       module</ulink> and copy it into your site_perl directory.</para>