diff --git a/reference/stream/streamwrapper/stream-lock.xml b/reference/stream/streamwrapper/stream-lock.xml
new file mode 100644
index 0000000000..5698a7e96b
--- /dev/null
+++ b/reference/stream/streamwrapper/stream-lock.xml
@@ -0,0 +1,135 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- $Revision: 1.1 $ -->
+
+<refentry xml:id="streamwrapper.stream-lock" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
+ <refnamediv>
+  <refname>streamWrapper::stream_lock</refname>
+  <refpurpose>Advisory file locking</refpurpose>
+ </refnamediv>
+
+ <refsect1 role="description">
+  &reftitle.description;
+  <methodsynopsis>
+   <modifier>public</modifier> <type>bool</type><methodname>streamWrapper::stream_lock</methodname>
+   <methodparam><type>mode</type><parameter>operation</parameter></methodparam>
+  </methodsynopsis>
+  <para>
+   This method is called in response to <function>flock</function>, when
+   <function>file_put_contents</function> (when <parameter>flags</parameter>
+   contains <constant>LOCK_EX</constant>), and when closing the stream
+   (<constant>LOCK_UN</constant>).
+  </para>
+ </refsect1>
+
+ <refsect1 role="parameters">
+  &reftitle.parameters;
+  <para>
+   <variablelist>
+    <varlistentry>
+     <term><parameter>operation</parameter></term>
+     <listitem>
+      <para>
+       <parameter>operation</parameter> is one of the following:
+       <itemizedlist>
+        <listitem>
+         <simpara>
+          <constant>LOCK_SH</constant> to acquire a shared lock (reader).
+         </simpara>
+        </listitem>
+        <listitem>
+         <simpara>
+          <constant>LOCK_EX</constant> to acquire an exclusive lock (writer).
+         </simpara>
+        </listitem>
+        <listitem>
+         <simpara>
+          <constant>LOCK_UN</constant> to release a lock (shared or exclusive).
+         </simpara>
+        </listitem>
+        <listitem>
+         <simpara>
+          <constant>LOCK_NB</constant> if you don't want
+          <function>flock</function> to block while locking.
+          (not supported on Windows)
+         </simpara>
+        </listitem>
+       </itemizedlist>
+      </para>
+     </listitem>
+    </varlistentry>
+   </variablelist>
+  </para>
+ </refsect1>
+
+ <refsect1 role="returnvalues">
+  &reftitle.returnvalues;
+  <para>
+   &return.success;
+  </para>
+ </refsect1>
+
+ <refsect1 role="errors"><!-- {{{ -->
+  &reftitle.errors;
+  <para>
+   Emits <constant>E_WARNING</constant> if call to this method fails (i.e. not implemented).
+  </para>
+ </refsect1><!-- }}} -->
+ 
+
+<!--
+ <refsect1 role="examples">
+  &reftitle.examples;
+  <para>
+   <example>
+    <title><function>streamWrapper::stream_lock</function> example</title>
+    <programlisting role="php">
+<![CDATA[
+<?php
+/* ... */
+?>
+]]>
+    </programlisting>
+    &example.outputs.similar;
+    <screen>
+<![CDATA[
+...
+]]>
+    </screen>
+   </example>
+  </para>
+ </refsect1>
+-->
+
+ <refsect1 role="seealso">
+  &reftitle.seealso;
+  <para>
+   <simplelist>
+    <member><function>stream_set_blocking</function></member>
+    <member><function>stream_set_timeout</function></member>
+    <member><function>stream_set_write_buffer</function></member>
+   </simplelist>
+  </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:"../../../../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
+-->
diff --git a/reference/stream/versions.xml b/reference/stream/versions.xml
index 5acb1f37a4..95f058c21a 100644
--- a/reference/stream/versions.xml
+++ b/reference/stream/versions.xml
@@ -1,5 +1,5 @@
 <?xml version='1.0' encoding='utf-8'?>
-<!-- $Revision: 1.7 $ -->
+<!-- $Revision: 1.8 $ -->
 <!--
   Do NOT translate this file
 -->
@@ -61,6 +61,7 @@
  <function name='streamwrapper::stream_close' from='PHP 4 &gt;= 4.3.2, PHP 5'/>
  <function name='streamwrapper::stream_eof' from='PHP 4 &gt;= 4.3.2, PHP 5'/>
  <function name='streamwrapper::stream_flush' from='PHP 4 &gt;= 4.3.2, PHP 5'/>
+ <function name='streamwrapper::stream_lock' from='PHP 5'/>
  <function name='streamwrapper::stream_open' from='PHP 4 &gt;= 4.3.2, PHP 5'/>
  <function name='streamwrapper::stream_read' from='PHP 4 &gt;= 4.3.2, PHP 5'/>
  <function name='streamwrapper::stream_seek' from='PHP 4 &gt;= 4.3.2, PHP 5'/>