-undo command, @kbd{C-x u} or @kbd{C-_}. This command undoes a single
-command (usually), a part of a command (in the case of
-@code{query-replace}), or several consecutive self-inserting characters.
-Consecutive repetitions of @kbd{C-_} or @kbd{C-x u} undo earlier and
-earlier changes, back to the limit of the undo information available.
-@xref{Undo}, for more information.
+undo command, @kbd{C-x u} or @kbd{C-_} or @kbd{C-/}. This command
+undoes a single command (usually), a part of a command (in the case of
+@code{query-replace}), or several consecutive self-inserting
+characters. Consecutive repetitions of the undo command undo earlier
+and earlier changes, back to the limit of the undo information
+available. @xref{Undo}, for more information.