diff --git a/chapters/install.windows.xml b/chapters/install.windows.xml
index d90c23c59f..c653436b49 100644
--- a/chapters/install.windows.xml
+++ b/chapters/install.windows.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.14 $ -->
+<!-- $Revision: 1.15 $ -->
   <sect1 id="install.windows">
    <title>Installation on Windows systems</title>
    <para>
@@ -387,6 +387,10 @@
        need one.  A free version is available from <ulink
        url="http://www.cdrom.com/pub/infozip/UnZip.html">InfoZip</ulink>.
       </simpara></listitem>
+      <listitem><simpara>If you are going to compile PHP as the Apache
+      module you also need the <ulink url="http://httpd.apache.org/dist/httpd/"
+      >Apache sources</ulink> of your version of Apache.
+      </simpara></listitem>
      </itemizedlist>
      <simpara>
       Finally, you are going to need the source to PHP 4 itself.