diff --git a/reference/pdf/functions/pdf-open-pdi-document.xml b/reference/pdf/functions/pdf-open-pdi-document.xml
new file mode 100644
index 0000000000..0df5bd0a0c
--- /dev/null
+++ b/reference/pdf/functions/pdf-open-pdi-document.xml
@@ -0,0 +1,42 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- $Revision$ -->
+<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.pdf-open-pdi-document">
+ <refnamediv>
+  <refname>PDF_open_pdi_document</refname>
+  <refpurpose>Prepare a pdi document</refpurpose>
+ </refnamediv>
+
+ <refsect1 role="description">
+  &reftitle.description;
+  <methodsynopsis>
+   <type>int</type><methodname>PDF_open_pdi_document</methodname>
+   <methodparam><type>resource</type><parameter>p</parameter></methodparam>
+   <methodparam><type>string</type><parameter>filename</parameter></methodparam>
+   <methodparam><type>string</type><parameter>optlist</parameter></methodparam>
+  </methodsynopsis>
+  <para>
+   Open a disk-based or virtual PDF document and prepare it for later use.
+  </para>
+ </refsect1>
+</refentry>
+
+<!-- Keep this comment at the end of the file
+Local variables:
+mode: sgml
+sgml-omittag:t
+sgml-shorttag:t
+sgml-minimize-attributes:nil
+sgml-always-quote-attributes:t
+sgml-indent-step:1
+sgml-indent-data:t
+indent-tabs-mode:nil
+sgml-parent-document:nil
+sgml-default-dtd-file:"~/.phpdoc/manual.ced"
+sgml-exposed-tags:nil
+sgml-local-catalogs:nil
+sgml-local-ecat-files:nil
+End:
+vim600: syn=xml fen fdm=syntax fdl=2 si
+vim: et tw=78 syn=sgml
+vi: ts=1 sw=1
+-->