diff --git a/functions/mcal.xml b/functions/mcal.xml
index bd074b7f23..c6752aa499 100644
--- a/functions/mcal.xml
+++ b/functions/mcal.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.27 $ -->
+<!-- $Revision: 1.28 $ -->
  <reference id="ref.mcal">
   <title>MCAL functions</title>
   <titleabbrev>MCAL</titleabbrev>
@@ -1307,6 +1307,29 @@
    </refsect1>
   </refentry>
 
+  <refentry id='function.mcal-week-of-year'>
+   <refnamediv>
+    <refname>mcal_week_of_year</refname>
+    <refpurpose>
+     Returns the week number of the given date
+    </refpurpose>
+   </refnamediv>
+   <refsect1>
+    <title>Description</title>
+    <funcsynopsis>
+     <funcprototype>
+      <funcdef>int <function>mcal_week_of_year</function></funcdef>
+      <paramdef>int <parameter>day</parameter></paramdef>
+      <paramdef>int <parameter>month</parameter></paramdef>
+      <paramdef>int <parameter>year</parameter></paramdef>
+     </funcprototype>
+    </funcsynopsis>
+    <para>
+     &warn.undocumented.func;
+    </para>
+   </refsect1>
+  </refentry>
+
 </reference>
 
 <!-- Keep this comment at the end of the file