A document supplementary to a will made earlier which is executed by a testator with the intention of adding to, alternating, revoking, explaining or confirming a will, provision or part of a will. As a subsidiary testamentary document, a codicil must be executed with the same formalities as a will and when so executed, becomes part of the will and must be proved with the will: Butterworths Concise Legal Dictionary (3^rd ed, 2004) 71.