body: I know in some contracts it specifically states "this contract can only be modified in writing by an addendum". I've read this is redundant as it's always true. I've also seen explicit terms in addenda saying things like "this addendum takes precedence, supersedes or prevails over any conflicts, contradictions or inconsistencies with the contract". Is this necessary? Isn't this type of statement redundant too as that's the whole point of an addendum?
  
  
  Is there a natural limit to an addendum, for example is a new contract ever required? For example say the initial contract says "Joe will pay Sam $100 each month" but then the addendum says "Joe will pay Robert $200 bi-monthly". Is this the point of having the clause about supersede/precedents?
  
  
  Basically what I'm asking is, are there any rules for addenda, for example can they both add to, remove from and modify the original contract?
  
  
  
title: When and how does an addendum apply?