quoting Rhetorica:

We now have two kinds of notes: inline notes+these are indicated using [plus]blah[/plus] and footnotes.[note]these are indicated using [note]blah[/note][/note] Enjoy.

also these still work

Having more than one [plus][/plus] per linebreak puts everything between the first opening [plus] and the last closing [/plus] into the mouseover note, regardless of how many opening and closing [plus]usses there are inside.