In contract law, "revocation" can also refer to the termination of an offer. An offeror may revoke an offer before it has been accepted, but the revocation must be communicated to the offeree, although not necessarily by the offeror. If the offer was made to the entire world, such as in Carlill v Carbolic Smoke Ball Company, the revocation must take a form that is similar to the offer. However, an offer may not be revoked if it has been encapsulated in an option.