diff --git a/functions/var.xml b/functions/var.xml
index 651b9dc1c8..b39b0b8482 100644
--- a/functions/var.xml
+++ b/functions/var.xml
@@ -531,6 +531,16 @@ print_r ($a);
 ?>
       </programlisting>
      </informalexample>
+    </para>
+		<para>
+     <warning>
+      This function will continue forever if given an array or object 
+      that contains a direct or indirect reference to itself or that 
+      contains an array or object on a deepre level that does so.
+      This is especially true for <literal>print_r($GLOBALS)</literal>, 
+      as <literal>$GLOBALS</literal> is itself a global variable and
+      contains a reference to itself as such.
+     </warning>
     </para>
    </refsect1>
   </refentry>