Are you asking legally?

If not, there is really no standard. Do what you think looks best.

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The aim of an argument or discussion should not be victory, but progress.
Joseph Joubert, essayist (1754-1824)

Alot of the time it can be used as a bribe, kinda like offering them a higher rank at the end. There realy are no rules unless youve stipulated somewhere in a contract a specific placing or screen credit.

Make Love Not War!