diff --git a/reference/pfpro/configure.xml b/reference/pfpro/configure.xml
index 0ddf4f6074..5ffb86198b 100644
--- a/reference/pfpro/configure.xml
+++ b/reference/pfpro/configure.xml
@@ -1,11 +1,19 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.1 $ -->
+<!-- $Revision: 1.2 $ -->
 <section id="pfpro.installation">
  &reftitle.install;
  <para>
   These functions are only available if PHP has been compiled with the
   <option role="configure">--with-pfpro[=DIR]</option> option.
  </para>
+ <warning>
+  <para>
+   If you are planing to use this extension along with the <link
+    linkend="ref.openssl">OpenSSL</link> extension or with ModSSL, you should
+   compile this extension as shared: <option
+    role="configure">--with-pfpro=shared,/usr/local</option>.
+  </para>
+ </warning>
 </section>
 
 <!-- Keep this comment at the end of the file