diff --git a/lisp/tooltip.el b/lisp/tooltip.el
index 6c14b9fb82e..bb2a7bf54d9 100644
--- a/lisp/tooltip.el
+++ b/lisp/tooltip.el
@@ -118,10 +118,7 @@ position to pop up the tooltip."
   :group 'tooltip)
 
 (defcustom tooltip-gud-tips-p nil
-  "*Non-nil means show tooltips in GUD sessions.
-Setting this variable directly with `setq' has no effect;
-you should either set it with the Customization facility
-or use the function `tooltip-gud-tips-activate'."
+  "*Non-nil means show tooltips in GUD sessions."
   :type 'boolean
   :tag "GUD"
   :set #'(lambda (symbol on)