diff --git a/functions/datetime.xml b/functions/datetime.xml
index d3452ace36..84e708a5a3 100644
--- a/functions/datetime.xml
+++ b/functions/datetime.xml
@@ -332,7 +332,7 @@ $today = date("H:i:s");                         // 17:16:17
       </listitem>
       <listitem>
        <simpara>
-	"wday" - day of the week, numeric
+	"wday" - day of the week, numeric : from 0 as Sunday upt to 6 as Saturday
        </simpara>
       </listitem>
       <listitem>