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-rw-r--r--lisp/mb-depth.el3
1 files changed, 2 insertions, 1 deletions
diff --git a/lisp/mb-depth.el b/lisp/mb-depth.el
index f79b0f354e2..3cba6a41f2f 100644
--- a/lisp/mb-depth.el
+++ b/lisp/mb-depth.el
@@ -35,7 +35,8 @@
It is called with one argument, the minibuffer depth,
and must return a string."
:version "28.1"
- :type 'function
+ :type '(choice (const :tag "Default" nil)
+ (function))
:group 'minibuffer)
(defface minibuffer-depth-indicator '((t :inherit highlight))