(custom-documentation): Avoid nil spec in defface.

diff --git a/lisp/cus-edit.el b/lisp/cus-edit.el
index e68d2eab29336dd56540c6e40f2b15ba215adb5c..52f66038ea6d3694302476818944964c9955337c 100644 (file)
--- a/lisp/cus-edit.el
+++ b/lisp/cus-edit.el
@@ -2089,7 +2089,7 @@ and `face'."
       'custom-button-pressed
     'custom-button-pressed-unraised))
 
-(defface custom-documentation nil
+(defface custom-documentation '((t nil))
   "Face used for documentation strings in customization buffers."
   :group 'custom-faces)
 ;; backward-compatibility alias