diff --git a/language/oop5/patterns.xml b/language/oop5/patterns.xml
index dfcb81e496..9b828797ee 100644
--- a/language/oop5/patterns.xml
+++ b/language/oop5/patterns.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.2 $ -->
+<!-- $Revision: 1.3 $ -->
 <sect1 id="language.oop5.patterns">
  <title>Patterns</title>
  <para>
@@ -7,7 +7,7 @@
   They show a flexible solution to common programming problems.
  </para>
 
- <sect2>
+ <sect2 id="language.oop5.patterns.factory">
   <title>Factory</title>
   <para>
    The Factory pattern allows for the instantation of objects
@@ -55,7 +55,7 @@ $sqlite = Example::factory('SQLite');
   </example>
  </sect2>
 
- <sect2>
+ <sect2 id="language.oop5.patterns.singleton">
   <title>Singleton</title>
   <para>
    The Singleton pattern applies to situations in which