:You: as User

rectangle boundary {
  User -right--> (Use the application)
  (Special use) .left..> (Use the application) : <<extends>>\n{if permission}
}
note "This is a note ." as N1
(Use the wiki-tool) .. N1

usecase UC1 as "Use case description with
--
separator and a title:
..Conclusion..
This allows large descriptions."