diff --git a/functions/array.xml b/functions/array.xml
index 1ff4a2ae93..767aa81e6b 100644
--- a/functions/array.xml
+++ b/functions/array.xml
@@ -751,12 +751,14 @@ print $input[$rand_keys[1]]."\n";
      <funcprototype>
       <funcdef>array <function>array_reverse</function></funcdef>
       <paramdef>array <parameter>array</parameter></paramdef>
+      <paramdef>bool <parameter><optional>preserve_keys</optional></parameter></paramdef>
      </funcprototype>
     </funcsynopsis>
     <para>
      <function>Array_reverse</function> takes input
      <parameter>array</parameter> and returns a new array with the
-     order of the elements reversed.
+     order of the elements reversed, preserving the keys if
+     <parameter>preserve_keys</parameter> is true.
     </para>
     <para>
      <example>
@@ -764,13 +766,21 @@ print $input[$rand_keys[1]]."\n";
       <programlisting role="php">
 $input = array ("php", 4.0, array ("green", "red"));
 $result = array_reverse ($input);
+$result_keyed = array_reverse ($input, true);
       </programlisting>
      </example>
     </para>
     <para>
      This makes <varname>$result</varname> have <literal>array
-     (array ("green", "red"), 4.0, "php")</literal>.
+     (array ("green", "red"), 4.0, "php")</literal>. But
+     <varname>$result2[0]</varname> is still
+     <literal>"php"</literal>.
     </para>
+    <note>
+     <para>
+      The second parameter was added in PHP 4.0.3.
+     </para>
+    </note>
    </refsect1>
   </refentry>