diff --git a/reference/calendar/functions/jewishtojd.xml b/reference/calendar/functions/jewishtojd.xml
index 9fb189b6d8..534757d022 100644
--- a/reference/calendar/functions/jewishtojd.xml
+++ b/reference/calendar/functions/jewishtojd.xml
@@ -30,7 +30,12 @@
      <term><parameter>month</parameter></term>
      <listitem>
       <para>
-       The month as a number from 1 to 13
+       The month as a number from <literal>1</literal> to <literal>13</literal>,
+       where <literal>1</literal> means <literal>Tishri</literal>,
+       <literal>13</literal> means <literal>Elul</literal>, and
+       <literal>6</literal> <emphasis>and</emphasis> <literal>7</literal> mean
+       <literal>Adar</literal> in regular years, but <literal>Adar I</literal>
+       and <literal>Adar II</literal>, respectively, in leap years.
       </para>
      </listitem>
     </varlistentry>