+Next to every menu bar item, Emacs displays a key binding that runs
+the same command (if such a key binding exists). This serves as a
+convenient hint for users who do not know the key binding. If a
+command has multiple bindings, Emacs normally displays the first one
+it finds. You can specify one particular key binding by assigning an
+@code{:advertised-binding} symbol property to the command. For
+instance, the following tells Emacs to show @kbd{C-/} for the
+@code{undo} menu item:
+
+@smallexample
+(put 'undo :advertised-binding [?\C-/])
+@end smallexample
+
+@noindent
+If the @code{:advertised-binding} property specifies a key binding
+that the command does not actually have, it is ignored.
+