diff --git a/appendices/reserved.xml b/appendices/reserved.xml
index 10b07a1f07..86a7dfbf44 100755
--- a/appendices/reserved.xml
+++ b/appendices/reserved.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.55 $ -->
+<!-- $Revision: 1.56 $ -->
 
  <appendix id="reserved">
   <title>List of Reserved Words</title>
@@ -423,6 +423,13 @@
          Which request method was used to access the page; i.e. '<literal>GET</literal>',
          '<literal>HEAD</literal>', '<literal>POST</literal>', '<literal>PUT</literal>'.
         </simpara>
+        <note>
+         <para>
+          PHP script is terminated after sending headers (it means after
+          producing any output without output buffering) if the request method
+          was <literal>HEAD</literal>.
+         </para>
+        </note>
        </listitem>
       </varlistentry>