The biggest problem with user stories for me, is that the amount of text often ends up making the board view in JIRA hard to read!
Admin :: Roles :: Multiple Roles)
And the "story" part goes in the body:
"As an adminstrator I assign multiple roles to users so they have access to all the parts (and only those parts) of the application they need to do their job."
..with additional context, exceptions, rules, examples, etc, in the body.