diff --git a/reference/calendar/functions/juliantojd.xml b/reference/calendar/functions/juliantojd.xml
index 3c818d7f39..d132c1c3cd 100644
--- a/reference/calendar/functions/juliantojd.xml
+++ b/reference/calendar/functions/juliantojd.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.2 $ -->
+<!-- $Revision: 1.3 $ -->
 <!-- splitted from ./en/functions/calendar.xml, last change in rev 1.4 -->
   <refentry id="function.juliantojd">
    <refnamediv>
@@ -27,6 +27,13 @@
      year varied from one culture to another - not all accepted
      January as the first month.
     </para>
+    <caution>
+     <para>
+      Remember, the current calendar system being used worldwide is the
+      Gregorian calendar.  <function>gregoriantojd</function> can be used to
+      convert such dates to their Julian Day count.
+     </para>
+    </caution>
    </refsect1>
   </refentry>