One can probably shoehorn the notion, that one should take into account the knowledge, beliefs and attitude of one's audience, into these four maxims, though I think it could stand as one on its own.
Worth noting that you can still successfully communicate while flouting one or more of the maxims. Sarcasm and irony show that tone and context play largely into understanding as well.
A key point is balancing these, sometimes fully satisfying one will ignore another. Communication is all about balance.<p>Note that these apply to programming languages as much as they do to natural language.