diff --git a/language/types.xml b/language/types.xml
index ec1fb519c6..f380749469 100644
--- a/language/types.xml
+++ b/language/types.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.158 $ -->
+<!-- $Revision: 1.159 $ -->
  <chapter id="language.types">
   <title>Types</title>
 
@@ -2315,6 +2315,10 @@ $var = NULL;
      object of that class by passing the class name instead of an 
      object as the element with index 0.
     </para>
+    <para>
+     Apart common user-defined function, <function>create_function</function>
+     can be used to create an anonymous callback function.
+    </para>
 
     <para>
      <example>