It's best to shy away from explicitly including things like "2 minor revisions". Who determines if the change is minor or not? The client will always assume minimal effort is required. If the change is in fact minor, then just implement it.

If the change is significant, then provide a price for its implementation.

Specifying that minor revisions are included in the agreement provides too much ambiguity.

Then your interacting with your client in a rigid contractual way instead of a collaborative creative nature. Not nearly as fun and you spend a lot of time being very careful with your written words and your sign offs.