diff --git a/reference/math/constants.xml b/reference/math/constants.xml
index 7cfe6afa5c..e371aebcaf 100644
--- a/reference/math/constants.xml
+++ b/reference/math/constants.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.5 $ -->
+<!-- $Revision: 1.6 $ -->
 <appendix xml:id="math.constants" xmlns="http://docbook.org/ns/docbook">
  &reftitle.constants;
  &extension.constants.core;
@@ -100,6 +100,26 @@
       <entry>0.57721566490153286061</entry>
       <entry>Euler constant [5.2.0]</entry>
      </row>
+     <row>
+      <entry>PHP_ROUND_HALF_UP</entry> 
+      <entry>1</entry>
+      <entry>Round halves up [5.3.0]</entry>
+     </row>
+     <row>
+      <entry>PHP_ROUND_HALF_DOWN</entry> 
+      <entry>2</entry>
+      <entry>Round halves down [5.3.0]</entry>
+     </row>
+     <row>
+      <entry>PHP_ROUND_HALF_EVEN</entry> 
+      <entry>3</entry>
+      <entry>Round halves to even numbers [5.3.0]</entry>
+     </row>
+     <row>
+      <entry>PHP_ROUND_HALF_ODD</entry> 
+      <entry>4</entry>
+      <entry>Round halves to odd numbers [5.3.0]</entry>
+     </row>
     </tbody>
    </tgroup>
   </table>
diff --git a/reference/math/functions/round.xml b/reference/math/functions/round.xml
index 1b52185e36..0ce628b9c2 100644
--- a/reference/math/functions/round.xml
+++ b/reference/math/functions/round.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.13 $ -->
+<!-- $Revision: 1.14 $ -->
 <refentry xml:id="function.round" xmlns="http://docbook.org/ns/docbook">
  <refnamediv>
   <refname>round</refname>
@@ -11,6 +11,7 @@
     <type>float</type><methodname>round</methodname>
     <methodparam><type>float</type><parameter>val</parameter></methodparam>
     <methodparam choice="opt"><type>int</type><parameter>precision</parameter></methodparam>
+    <methodparam choice="opt"><type>int</type><parameter>mode</parameter><initializer>PHP_ROUND_HALF_UP</initializer></methodparam>
    </methodsynopsis>
   <para>
    Returns the rounded value of <parameter>val</parameter> to
@@ -72,6 +73,17 @@
       </para>
      </listitem>
     </varlistentry>
+    <varlistentry>
+     <term><parameter>mode</parameter></term>
+     <listitem>
+      <para>
+       One of <constant>PHP_ROUND_HALF_UP</constant>,
+       <constant>PHP_ROUND_HALF_DOWN</constant>,
+       <constant>PHP_ROUND_HALF_EVEN</constant>, or
+       <constant>PHP_ROUND_HALF_ODD</constant>.
+      </para>
+     </listitem>
+    </varlistentry>
    </variablelist>
   </para>
  </refsect1>
@@ -103,6 +115,29 @@ echo round(5.055, 2);    // 5.06
    </example>
   </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>5.3.0</entry>
+       <entry>
+         The <parameter>mode</parameter> parameter was introduced.
+       </entry>
+      </row>
+     </tbody>
+    </tgroup>
+   </informaltable>
+  </para>
+ </refsect1>
  <refsect1 role="seealso">
   &reftitle.seealso;
   <para>