diff --git a/appendices/reserved.xml b/appendices/reserved.xml
index d5d4c8f318..b4ea3727ac 100755
--- a/appendices/reserved.xml
+++ b/appendices/reserved.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.61 $ -->
+<!-- $Revision: 1.62 $ -->
 
  <appendix id="reserved">
   <title>List of Reserved Words</title>
@@ -569,6 +569,11 @@
          Set to a non-empty value if the script was queried through the HTTPS
          protocol.
         </simpara>
+        <simpara>
+         Note that when using ISAPI with IIS, the value will be 
+         <literal>off</literal> if the request was not made through the HTTPS
+         protocol.
+        </simpara>
        </listitem>
       </varlistentry>