diff --git a/language/variables.xml b/language/variables.xml
index 521c55098e..5288ebd316 100644
--- a/language/variables.xml
+++ b/language/variables.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.45 $ -->
+<!-- $Revision: 1.46 $ -->
  <chapter id="language.variables">
   <title>Variables</title>
   
@@ -528,6 +528,13 @@ echo "$a $hello";
     is: <varname>${$a[1]}</varname> for the first case and
     <varname>${$a}[1]</varname> for the second.
    </simpara>
+   
+   <simpara>
+    Please note that variable variables cannot be used with PHP's new superglobals.
+    This means you cannot do things like <varname>${$_GET}</varname>. If you are 
+    looking for a way to handle availability of superglobals and the old
+    HTTP_*_VARS, you might want to try <link linkend="language.references">referencing</link> them.
+   </simpara>
   
   </sect1>