-typing @kbd{C-h} (@code{describe-prefix-bindings}) after the prefix
-key. (There are a few prefix keys for which this does not
-work---those that provide their own bindings for @kbd{C-h}. One of
-these is @key{ESC}, because @kbd{@key{ESC} C-h} is actually
-@kbd{C-M-h}, which marks a defun.)
+typing @kbd{C-h}, @kbd{?}, or @key{F1}
+(@code{describe-prefix-bindings}) after the prefix key. (There are a
+few prefix keys for which not all of these keys work---those that
+provide their own bindings for that key. One of these prefix keys
+is @key{ESC}, because @kbd{@key{ESC} C-h} is actually @kbd{C-M-h},
+which marks a defun. However, @kbd{@key{ESC} @key{F1}} and
+@kbd{@key{ESC} ?} work fine.)