diff --git a/functions/datetime.xml b/functions/datetime.xml
index fedf1b41f5..a907def3d5 100644
--- a/functions/datetime.xml
+++ b/functions/datetime.xml
@@ -654,6 +654,14 @@ echo strftime ("Last day in Feb 2000 is: %d", $lastday);
 	week
        </simpara>
       </listitem>
+      <listitem>
+       <simpara> 
+        %V - The  ISO 8601:1988 week number of the current year as a
+        decimal number, range 01 to 53, where week 1 is the first
+        week that has at least 4 days in the current year, and with
+        Monday as the first day of the week.
+       </simpara>
+      </listitem>
       <listitem>
        <simpara>
 	%W - week number of the current year as a decimal number,