diff --git a/language/variables.xml b/language/variables.xml
index ec3d6915d8..542d55dda5 100644
--- a/language/variables.xml
+++ b/language/variables.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.54 $ -->
+<!-- $Revision: 1.55 $ -->
  <chapter id="language.variables">
   <title>Variables</title>
   
@@ -169,6 +169,14 @@ $bar = &test();    // Invalid.
     Also, you'll notice how the older predefined variables 
     (<varname>$HTTP_*_VARS</varname>) still exist.
    </simpara>
+   
+   <note>
+    <title>Variable variables</title>
+    <para>
+     Superglobals cannot be used as 
+     <link linkend="language.variables.variable">variable variables</link>.
+    </para>
+   </note>
 
    <para>
     If certain variables in <link