diff --git a/functions/pdf.sgml b/functions/pdf.sgml
index f7023cdc87..f417b1e60f 100644
--- a/functions/pdf.sgml
+++ b/functions/pdf.sgml
@@ -30,9 +30,10 @@
 
    <simpara>
     There is another PHP module for pdf document creation based on
-    FastIO's ClibPDF. It has a slightly different API. Check the
+    <ulink url="http://www.fastio.com">FastIO's</ulink>.
+    ClibPDF. It has a slightly different API. Check the
     <link linkend="ref.cpdf">ClibPDF functions</link> section for
-    details. This one is not available in PHP4, yet.</simpara>
+    details.</simpara>
 
    <simpara>
     Currently all versions of pdflib are supported. It