diff --git a/doc/cookbook/actors.xml b/doc/cookbook/actors.xml
index 4ae735779..eab25008b 100644
--- a/doc/cookbook/actors.xml
+++ b/doc/cookbook/actors.xml
@@ -72,9 +72,7 @@
         heavily on GObject concepts and idioms. If you are unfamiliar with
         GObject, please read
         <ulink url="http://developer.gnome.org/gobject/stable/">the GObject
-        Reference Manual</ulink> before proceeding. You might also find
-        <ulink url="http://diuf.unifr.ch/pai/wiki/doku.php/research:projects:gobject_tutorial">this
-        tutorial</ulink> a useful introduction.</para>
+        Reference Manual</ulink> before proceeding.</para>
       </tip>
 
       <para>The code for this solution is structured like standard GObject