diff --git a/language/oop5/object-comparison.xml b/language/oop5/object-comparison.xml
index ca79642bf7..5dd4c11294 100755
--- a/language/oop5/object-comparison.xml
+++ b/language/oop5/object-comparison.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.5 $ -->
+<!-- $Revision: 1.6 $ -->
   <sect1 xml:id="language.oop5.object-comparison" xmlns="http://docbook.org/ns/docbook">
    <title>Comparing objects</title>
    <para>
@@ -100,6 +100,11 @@ o1 !== o2 : TRUE
      </screen>
     </example>
    </para>
+   <note>
+    <para>
+     Extensions can define own rules for their objects comparison.
+    </para>
+   </note>
   </sect1>
  
 <!-- Keep this comment at the end of the file