Revision policy - three clauses
-------------------------------

REVISIONS

1. This quote includes [two] rounds of revisions. A round is one
   consolidated set of changes covering all reviewers, sent together
   after you have gathered everyone's comments.

2. Corrections of our own errors, and changes needed to make the file
   printable, are not counted as rounds.

3. Further rounds, changes of direction, new content supplied after
   the brief, or review by someone outside the approval chain agreed
   at the start, are charged at [rate] and may affect the delivery
   date. We will tell you before starting, not after.

proofavo.com/blog/revision-policy-template