A clause letting one side change the terms without the other side agreeing.
A unilateral-modification clause reserves to one party — in practice, whoever drafted the contract — the right to change the agreement later, on its own. It is the machinery behind “we may update these terms at any time” in subscription contracts, terms of service, and credit agreements.
“We may modify these Terms at any time. Continued use constitutes acceptance.”
Before you sign, Main AI reads the actual contract and flags where a clause like this shifts risk onto you — in plain language, tied to the exact wording.
Analyze my document free →A contract normally needs both sides to agree to a change, so these clauses sit in real tension with basic contract doctrine, and courts tend to look at two things: notice and consideration. A clause permitting changes with no notice and no way out can be attacked as illusory — if one side can rewrite the deal at will, the argument runs, it never truly promised anything. Versions that give advance notice, publish what changed, and let you leave before it takes effect are far more likely to survive. Two patterns are worth watching for specifically: a change written to reach backwards into a dispute that already exists, and a modification used to insert an arbitration clause or class-action waiver into an agreement that did not originally contain one.
See this in your own document: run a free analysis — findings quote the exact language.
“Company reserves the right, in its sole discretion, to modify these Terms at any time and without prior notice. Your continued use of the Service after any such change constitutes your acceptance.”
“Sole discretion … without prior notice … continued use constitutes acceptance” is the strongest form of this clause and also the most vulnerable one. The practical checks are short: is there a notice period, is there an exit without penalty, and does a change apply only going forward? If a term you are relying on can be rewritten next month without telling you, it is worth treating as a term you do not really have.