diff --git a/reference/array/functions/array-unique.xml b/reference/array/functions/array-unique.xml
index d4929b4aae..d8eecb0114 100644
--- a/reference/array/functions/array-unique.xml
+++ b/reference/array/functions/array-unique.xml
@@ -1,15 +1,17 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.17 $ -->
+<!-- $Revision: 1.18 $ -->
 <refentry xml:id="function.array-unique" xmlns="http://docbook.org/ns/docbook">
  <refnamediv>
   <refname>array_unique</refname>
   <refpurpose>Removes duplicate values from an array</refpurpose>
  </refnamediv>
+
  <refsect1 role="description">
   &reftitle.description;
   <methodsynopsis>
    <type>array</type><methodname>array_unique</methodname>
    <methodparam><type>array</type><parameter>array</parameter></methodparam>
+   <methodparam choice="opt"><type>int</type><parameter>sort_flags</parameter></methodparam>
   </methodsynopsis>
   <para>
    Takes an input <parameter>array</parameter> and returns a new array
@@ -33,6 +35,7 @@
    </simpara>
   </note>
  </refsect1>
+
  <refsect1 role="parameters">
   &reftitle.parameters;
   <para>
@@ -45,15 +48,73 @@
       </para>
      </listitem>
     </varlistentry>
+    <varlistentry>
+     <term><parameter>sort_flags</parameter></term>
+     <listitem>
+      <para>
+       The optional second parameter <parameter>sort_flags</parameter>
+       may be used to modify the sorting behavior using these values:
+      </para>
+      <para>
+       Sorting type flags:
+       <itemizedlist>
+        <listitem>
+         <simpara><constant>SORT_REGULAR</constant> - compare items normally
+         (don't change types)</simpara>
+        </listitem>
+        <listitem>
+         <simpara><constant>SORT_NUMERIC</constant> - compare items numerically</simpara>
+        </listitem>
+        <listitem>
+         <simpara><constant>SORT_STRING</constant> - compare items as strings</simpara>
+        </listitem>
+        <listitem>
+         <simpara><constant>SORT_LOCALE_STRING</constant> - compare items as
+          strings, based on the current locale. Added in PHP 4.4.0 and 5.0.2.
+          Before PHP 6, it uses the system locale, which can be changed using
+          <function>setlocale</function>. Since PHP 6, you must use the
+          <function>i18n_loc_set_default</function> function.
+         </simpara>
+        </listitem>
+       </itemizedlist>
+      </para>
+     </listitem>
+    </varlistentry>
    </variablelist>
   </para>
  </refsect1>
+
  <refsect1 role="returnvalues">
   &reftitle.returnvalues;
   <para>
    Returns the filtered array.
   </para>
  </refsect1>
+
+ <refsect1 role="changelog">
+  &reftitle.changelog;
+  <para>
+   <informaltable>
+    <tgroup cols="2">
+     <thead>
+      <row>
+       <entry>&Version;</entry>
+       <entry>&Description;</entry>
+      </row>
+     </thead>
+     <tbody>
+      <row>
+       <entry>5.2.9</entry>
+       <entry>
+        Added the optional <parameter>sort_flags</parameter>.
+       </entry>
+      </row>
+     </tbody>
+    </tgroup>
+   </informaltable>
+  </para>
+ </refsect1>
+
  <refsect1 role="examples">
   &reftitle.examples;
   <para>
@@ -105,6 +166,7 @@ array(2) {
    </example>
   </para>
  </refsect1>
+
 </refentry>
 
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