diff --git a/appendices/predefined.xml b/appendices/predefined.xml
index 75bb9035fc..2b54d6254b 100644
--- a/appendices/predefined.xml
+++ b/appendices/predefined.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.10 $ -->
+<!-- $Revision: 1.11 $ -->
 
 <!-- Note:  Please do not link or translate this file yet.
 This is only an initial update, quite a few more commits will
@@ -309,7 +309,8 @@ follow for this appendix. -->
        <listitem>
         <simpara>
          Contains the current script's path. This is useful for pages
-         which need to point to themselves.
+         which need to point to themselves. Please note that in a CGI
+         environment the variable contains the path to the PHP binary.
         </simpara>
        </listitem>
       </varlistentry>