diff --git a/appendices/phpdevel.xml b/appendices/phpdevel.xml
index e99c1a7ebc..ae792a820d 100644
--- a/appendices/phpdevel.xml
+++ b/appendices/phpdevel.xml
@@ -1,9 +1,16 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.22 $ -->
+<!-- $Revision: 1.23 $ -->
 <appendix id="phpdevel">
- <title>Extending PHP</title>
+ <title>Extending PHP 3</title>
 
- <simpara></simpara>
+ <simpara>
+  This section is rather outdated and demonstrates how to extend
+  PHP 3.  If you're interested in PHP 4, please read the section
+  on the <link linkend="zend">Zend API</link>.  Also, you'll want 
+  to read various files found in the PHP source, files such as 
+  <filename>README.SELF-CONTAINED-EXTENSIONS</filename> and 
+  <filename>README.EXT_SKEL</filename>.
+ </simpara>
 
  <sect1 id="phpdevel-addfunc">
   <title>Adding functions to PHP</title>