I think you should number fingers on the keys that they should play. it's easier to read!!
Dana: I frequently do put finger numbers in for my own students, in pencil... but only after observing them, usually, to see if they can figure out a fingering for themselves. This is something that pianists need to work out for themselves, and unless I feel very strongly about a fingering that I want to recommend, I prefer to leave it up to each teacher!