- "Customize options related to the current major mode.
-If a prefix \\[universal-argument] was given (or if the current major mode has no known group),
-then prompt for the MODE to customize."
+ "Customize options related to a major or minor mode.
+By default the current major mode is used. With a prefix
+argument or if the current major mode has no known group, prompt
+for the MODE to customize."