Amendment (noun)

1. A change or addition made to a text, bill, constitution, etc.
2. A formal proposal to make a change to a document such as a constitution or law.
3. A change or correction that improves something.

Origin:

Late middle english: from old french amandement, from amender "correct, improve", from à "to" + mender "make good", from latin emendare.

Examples:

1. The amendment to the bill was accepted.
2. The constitution has been amended several times.
3. The amendment to the contract was accepted.
4. He proposed an amendment to the budget.
5. The amendment will improve the safety of the product.