diff --git a/functions/shmop.xml b/functions/shmop.xml
index f24d2b14f5..c89fb60b5d 100755
--- a/functions/shmop.xml
+++ b/functions/shmop.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.12 $ -->
+<!-- $Revision: 1.13 $ -->
 <reference id="ref.shmop">
   <title>Shared Memory Functions</title>
   <titleabbrev>shmop</titleabbrev>
@@ -13,6 +13,10 @@
     in your configure line.
    </para>
    <note>
+    <simpara>
+     This module is experimental. API and others are subject to be
+     changed without notice.
+    </simpara>
     <simpara>
 	 In PHP 4.0.3, there functions were prefixed by <literal>shm</literal>
 	 rather than <literal>shmop</literal>.