diff --git a/lisp/calendar/icalendar.el b/lisp/calendar/icalendar.el
index 8881796c94b..784881e4012 100644
--- a/lisp/calendar/icalendar.el
+++ b/lisp/calendar/icalendar.el
@@ -250,6 +250,7 @@ on the current day and continues for the number of days given here.
 
 See `icalendar-export-sexp-enumerate-all' for a list of sexp
 entries which by default are NOT enumerated."
+  :version "24.5"
   :type 'integer
   :group 'icalendar)
 
@@ -262,6 +263,7 @@ translating into an icalendar equivalent.  This affects the
 following sexp diary entries: `diary-anniversary',
 `diary-cyclic', `diary-date', `diary-float',`diary-block'.  All
 other sexp entries are enumerated in any case."
+  :version "24.5"
   :type 'boolean
   :group 'icalendar)