diff --git a/reference/memcached/constants.xml b/reference/memcached/constants.xml
index 1e678e63fc..0e47102026 100644
--- a/reference/memcached/constants.xml
+++ b/reference/memcached/constants.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!-- $Revision: 1.8 $ -->
+<!-- $Revision: 1.9 $ -->
 
 <appendix xml:id="memcached.constants" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
  &reftitle.constants;
@@ -48,6 +48,13 @@
    </listitem>
   </varlistentry>
 
+  <varlistentry xml:id="memcached.constants.serializer-json">
+   <term><constant>Memcached::SERIALIZER_JSON</constant></term>
+   <listitem>
+    <para>The JSON serializer. Requires PHP 5.2.10+.</para>
+   </listitem>
+  </varlistentry>
+
   <varlistentry xml:id="memcached.constants.opt-prefix-key">
    <term><constant>Memcached::OPT_PREFIX_KEY</constant></term>
    <listitem>
@@ -300,6 +307,32 @@
    </listitem>
   </varlistentry>
 
+  <varlistentry xml:id="memcached.constants.have-igbinary">
+   <term><constant>Memcached::HAVE_IGBINARY</constant></term>
+   <listitem>
+    <para>Indicates whether igbinary serializer support is available.</para>
+    <para>Type: <literal>boolean</literal>.</para>
+   </listitem>
+  </varlistentry>
+
+  <varlistentry xml:id="memcached.constants.have-json">
+   <term><constant>Memcached::HAVE_JSON</constant></term>
+   <listitem>
+    <para>Indicates whether JSON serializer support is available.</para>
+    <para>Type: <literal>boolean</literal>.</para>
+   </listitem>
+  </varlistentry>
+
+  <varlistentry xml:id="memcached.constants.get-preserve-order">
+   <term><constant>Memcached::GET_PRESERVE_ORDER</constant></term>
+   <listitem>
+    <para>A flag for <function>Memcached::getMulti</function> and
+     <function>Memcached::getMultiByKey</function> to ensure that the keys are
+     returned in the same order as they were requested in. Non-existing keys
+     get a default value of NULL.</para>
+   </listitem>
+  </varlistentry>
+
   <varlistentry xml:id="memcached.constants.res-success">
    <term><constant>Memcached::RES_SUCCESS</constant></term>
    <listitem>
diff --git a/reference/memcached/memcached/getmulti.xml b/reference/memcached/memcached/getmulti.xml
index 7b122d07bc..6ce29fe02a 100644
--- a/reference/memcached/memcached/getmulti.xml
+++ b/reference/memcached/memcached/getmulti.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!-- $Revision: 1.5 $ -->
+<!-- $Revision: 1.6 $ -->
 
 <refentry xml:id="memcached.getmulti" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
  <refnamediv>
@@ -13,6 +13,7 @@
    <modifier>public</modifier> <type>mixed</type><methodname>Memcached::getMulti</methodname>
    <methodparam><type>array</type><parameter>keys</parameter></methodparam>
    <methodparam choice="opt"><type>array</type><parameter role="reference">cas_tokens</parameter></methodparam>
+   <methodparam choice="opt"><type>integer</type><parameter>flags</parameter></methodparam>
   </methodsynopsis>
   <para>
    <function>Memcached::getMulti</function> is similar to
@@ -31,6 +32,13 @@
     </para>
    </note>
   </para>
+  <para>
+   The <parameter>flags</parameter> parameter can be used to specify
+   additional options for <function>Memcached::getMulti</function>. Currently,
+   the only available option is
+   <constant>Memcached::GET_PRESERVE_ORDER</constant> that ensures that the
+   keys are returned in the same order as they were requested in.
+  </para>
  </refsect1>
 
  <refsect1 role="parameters">
@@ -53,6 +61,14 @@
       </para>
      </listitem>
     </varlistentry>
+    <varlistentry>
+     <term><parameter>flags</parameter></term>
+     <listitem>
+      <para>
+       The flags for the get operation.
+      </para>
+     </listitem>
+    </varlistentry>
    </variablelist>
   </para>
  </refsect1>
@@ -102,6 +118,49 @@ array(2) {
   ["key3"]=>
   float(2362)
 }
+]]>
+    </screen>
+   </example>
+  </para>
+  <para>
+   <example>
+    <title><constant>Memcached::GET_PRESERVE_ORDER</constant> example</title>
+    <programlisting role="php">
+<![CDATA[
+<?php
+$m = new Memcached();
+$m->addServer('localhost', 11211);
+
+$data = array(
+    'foo' => 'foo-data',
+    'bar' => 'bar-data',
+    'baz' => 'baz-data',
+    'lol' => 'lol-data',
+    'kek' => 'kek-data',
+);
+
+$m->setMulti($data, 3600);
+
+$null = null;
+$keys = array_keys($data);
+$keys[] = 'zoo';
+$got = $m->getMulti($keys, $null, Memcached::GET_PRESERVE_ORDER);
+
+foreach ($got as $k => $v) {
+    echo "$k $v\n";
+}
+?>
+]]>
+    </programlisting>
+    &example.outputs.similar;
+    <screen>
+<![CDATA[
+foo foo-data
+bar bar-data
+baz baz-data
+lol lol-data
+kek kek-data
+zoo 
 ]]>
     </screen>
    </example>
diff --git a/reference/memcached/memcached/getmultibykey.xml b/reference/memcached/memcached/getmultibykey.xml
index 5018fccdf2..71c44ecb96 100644
--- a/reference/memcached/memcached/getmultibykey.xml
+++ b/reference/memcached/memcached/getmultibykey.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!-- $Revision: 1.3 $ -->
+<!-- $Revision: 1.4 $ -->
 
 <refentry xml:id="memcached.getmultibykey" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
  <refnamediv>
@@ -14,6 +14,7 @@
    <methodparam><type>string</type><parameter>server_key</parameter></methodparam>
    <methodparam><type>array</type><parameter>keys</parameter></methodparam>
    <methodparam choice="opt"><type>string</type><parameter role="reference">cas_tokens</parameter></methodparam>
+   <methodparam choice="opt"><type>integer</type><parameter>flags</parameter></methodparam>
   </methodsynopsis>
   <para>
    <function>Memcached::getMultiByKey</function> is functionally equivalent to
@@ -51,6 +52,14 @@
       </para>
      </listitem>
     </varlistentry>
+    <varlistentry>
+     <term><parameter>flags</parameter></term>
+     <listitem>
+      <para>
+       The flags for the get operation.
+      </para>
+     </listitem>
+    </varlistentry>
    </variablelist>
   </para>
  </refsect1>