diff --git a/reference/session/reference.xml b/reference/session/reference.xml
index a59c6d23ba..904efb13e4 100644
--- a/reference/session/reference.xml
+++ b/reference/session/reference.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.47 $ -->
+<!-- $Revision: 1.48 $ -->
  <reference id="ref.session">
   <title>Session Handling Functions</title>
   <titleabbrev>Sessions</titleabbrev>
@@ -211,6 +211,12 @@ unset($_SESSION['count']);
       </para>
      </caution>
     </para>
+    <warning>
+     <para>
+      You can't use references in session variables as there is no feasible way
+      to restore reference to other variable.
+     </para>
+    </warning>
     <para>
      <example>
       <title>