diff --git a/reference/calendar/functions/cal-from-jd.xml b/reference/calendar/functions/cal-from-jd.xml
index dea4c5d154..33262aa0b2 100644
--- a/reference/calendar/functions/cal-from-jd.xml
+++ b/reference/calendar/functions/cal-from-jd.xml
@@ -53,8 +53,10 @@
   &reftitle.returnvalues;
   <para>
    Returns an array containing calendar information like month, day, year,
-   day of week, abbreviated and full names of weekday and month and the
+   day of week (<literal>dow</literal>), abbreviated and full names of weekday and month and the
    date in string form "month/day/year".
+   The day of week ranges from <literal>0</literal> (Sunday) to
+   <literal>6</literal> (Saturday).
   </para>
  </refsect1>