-(defun notmuch-show-toggle-all ()
- "Change the visibility all of the messages in the current
-thread. By default make all of the messages visible. With a
-prefix argument, make them all not visible."
+(defun notmuch-show-open-or-close-all ()
+ "Set the visibility all of the messages in the current thread.
+By default make all of the messages visible. With a prefix
+argument, hide all of the messages."