What It Does
An amendment clause, also called a contract amendment clause, modification clause, or no-oral-modification (NOM) clause, requires any change to the contract to be made in a written instrument signed by the parties. It blocks a party from later claiming the deal was altered by an email, a phone call, or a course of conduct. Most versions require signatures from both sides, though some let one party amend unilaterally on notice. Courts generally enforce these clauses, with limits: under UCC 2-209 and some common-law rules, a party's conduct or reliance can still waive the writing requirement.
Requires any amendment to be in writing and signed by the parties
Blocks claims that an oral agreement or email changed the terms
Names who has authority to sign an amendment on each side
Sets whether one party may amend unilaterally, and on what notice
Works with the no-waiver clause to keep informal conduct from rewriting the deal
Signed-writing requirements for amendments are near-universal in commercial contracts, while unilateral amendment rights remain common in click-through and SaaS terms.
When You'll See It
The amendment clause appears in the boilerplate of almost every contract: commercial agreements, purchase agreements, employment letters, license agreements, and credit facilities. It lives in the miscellaneous or general provisions, next to waiver and entire agreement. The drafting varies most in SaaS and online terms, where vendors reserve the right to amend unilaterally.
It matters most where a relationship evolves through day-to-day practice, because that is where conduct-based modification arguments arise. The more your teams improvise around the written terms, the more this clause decides whether the contract still says what it says.
Examples
Barnes & Noble Education, Inc.
Kevin Watson, Amended Employment Letter
Writing signed by both
Mutual
2024
"[This letter agreement] may not be amended or modified except by an instrument in writing signed by you and the Company."
Lexicon Pharmaceuticals, Inc.
Invus US Partners LLC, Purchase Agreement
Writing signed by both
Mutual
2022
"[This Agreement] may not be amended or modified except by an instrument in writing signed by, or on behalf of, the parties hereto."
Blue Owl Capital Holdings LLC
Blue Owl Technology Income Corp., License Agreement
Writing signed by all parties
Mutual
2023
"[This Agreement] may not be amended or modified except by an instrument in writing signed by all parties hereto."
Axalta Coating Systems Ltd.
Sean M. Lannon, Separation and Release Agreement
No oral modification + writing signed
Mutual
2023
"No Oral Modification. This Agreement may only be amended in a writing signed by Executive and a duly authorized officer of the Company."
Negotiate
You want no surprise changes
Require every amendment to be in a writing signed by authorized representatives of both parties.
Reject any unilateral amendment right, especially in vendor or SaaS terms.
Name the specific signatories or titles authorized to bind each side.
Pair the clause with a no-oral-modification statement and a no-waiver clause.
Require that each amendment reference the original agreement and its date.
You are the vendor
Reserve a right to amend operational terms on advance written notice.
Tie any unilateral change to a notice period and a right to terminate if rejected.
Allow amendment by exchange of signed counterparts or electronic signature.
Permit amendment of schedules or order forms without reopening the master agreement.
Keep a lightweight change-order process for routine adjustments.
If it is not in a signed writing, treat it as not in the deal.
Red Flags
A unilateral amendment right with no notice or right to terminate, letting one side rewrite terms at will.
A no-oral-modification clause with no no-waiver clause, leaving conduct-based modification arguments open.
Amendment authority granted to anyone, with no named or titled signatory.
Electronic acceptance treated as a signed amendment without clear assent.
A clause silent on schedules and order forms, so it is unclear whether they can change without a full amendment.
FAQs
This content is for informational purposes only and does not constitute legal advice.
