+ "*If non-nil, Gnus will read NoCeM cancel messages.
+You can also set this variable to a positive number as a group level.
+In that case, Gnus scans NoCeM messages when checking new news if this
+value is not exceeding a group level that you specify as the prefix
+argument to some commands, e.g. `gnus', `gnus-group-get-new-news', etc.
+Otherwise, Gnus does not scan NoCeM messages if you specify a group
+level to those commands."