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-rw-r--r--lisp/calendar/cal-islam.el4
1 files changed, 2 insertions, 2 deletions
diff --git a/lisp/calendar/cal-islam.el b/lisp/calendar/cal-islam.el
index 8dcf5c29b1f..1ac6f0677b1 100644
--- a/lisp/calendar/cal-islam.el
+++ b/lisp/calendar/cal-islam.el
@@ -29,8 +29,8 @@
;; diary.el that deal with the Islamic calendar.
;; Technical details of all the calendrical calculations can be found in
-;; ``Calendrical Calculations'' by Nachum Dershowitz and Edward M. Reingold,
-;; Cambridge University Press (1997).
+;; ``Calendrical Calculations: The Millennium Edition'' by Edward M. Reingold
+;; and Nachum Dershowitz, Cambridge University Press (2001).
;; Comments, corrections, and improvements should be sent to
;; Edward M. Reingold Department of Computer Science