Repairs to unit, settle one a single price with landlord?

[Brendan L.]

I did some minor damage to the walls in my apartment that I'm moving out of in 1.5 months, it does need to be repaired. Landlord did inspection and is asking for 250 to repair. How do I protect myself so he doesnt start nickel and diming me if he all of a sudden "finds" repairable damage he "didn't see and didnt include in that quote"? Do I ask for something to sign saying I agree to pay the 250 for "all" repairs ?