diff --git a/reference/xml/functions/xml-parse-into-struct.xml b/reference/xml/functions/xml-parse-into-struct.xml
index d97f2b74aa..3f8c6caee1 100644
--- a/reference/xml/functions/xml-parse-into-struct.xml
+++ b/reference/xml/functions/xml-parse-into-struct.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.3 $ -->
+<!-- $Revision: 1.4 $ -->
 <!-- splitted from ./en/functions/xml.xml, last change in rev 1.11 -->
   <refentry id="function.xml-parse-into-struct">
    <refnamediv>
@@ -13,7 +13,7 @@
      <methodparam><type>resource</type><parameter>parser</parameter></methodparam>
      <methodparam><type>string</type><parameter>data</parameter></methodparam>
      <methodparam><type>array</type><parameter>&amp;values</parameter></methodparam>
-     <methodparam><type>array</type><parameter>&amp;index</parameter></methodparam>
+     <methodparam choice="opt"><type>array</type><parameter>&amp;index</parameter></methodparam>
     </methodsynopsis>
     <para>
      This function parses an XML file into 2 parallel array