1 files changed, 1 insertions, 1 deletions

diff --git a/lisp/calendar/cal-tex.el b/lisp/calendar/cal-tex.el
index a77eaafcf9e..011c4d3de76 100644
--- a/lisp/calendar/cal-tex.el
+++ b/lisp/calendar/cal-tex.el
@@ -128,7 +128,7 @@ will put the Hebrew date at the bottom of each day."
   "A string giving extra LaTeX commands to insert in the calendar preamble.
 For example, to include extra packages:
 \"\\\\usepackage{foo}\\n\\\\usepackage{bar}\\n\"."
-  :type 'string
+  :type '(choice (const nil) string)
   :group 'calendar-tex
   :version "22.1")