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-rw-r--r--lisp/cus-edit.el2
1 files changed, 1 insertions, 1 deletions
diff --git a/lisp/cus-edit.el b/lisp/cus-edit.el
index 3bc83604227..63753af76df 100644
--- a/lisp/cus-edit.el
+++ b/lisp/cus-edit.el
@@ -1142,7 +1142,7 @@ the official name of the package, such as MH-E or Gnus.")
(defalias 'customize-changed 'customize-changed-options)
;;;###autoload
-(defun customize-changed-options (since-version)
+(defun customize-changed-options (&optional since-version)
"Customize all settings whose meanings have changed in Emacs itself.
This includes new user option variables and faces, and new
customization groups, as well as older options and faces whose meanings