* lisp/gnus/gnus-group.el (gnus-group-default-list-level): Improve
doc string.
(defcustom gnus-group-default-list-level gnus-level-subscribed
"Default listing level.
-Ignored if `gnus-group-use-permanent-levels' is non-nil."
+When `gnus-group-use-permanent-levels' is non-nil, this level is
+used as the starting level until the user sets a different level,
+and is ignored afterwards."
:group 'gnus-group-listing
:type '(choice (integer :tag "Level")
(function :tag "Function returning level")))