You are able to use some HTML tags.
Use <b>bold text</b> to mark text as bold.
Use <i>italic</i> to mark text as italic.
Use <u>underline</u> to underline text.
Use <ul><li>List item 1</li><li>List item 2</li></ul> to create lists.
Use <a href="http://scout.org">Text displayed</a> to add a link.