Codicil

Codicil (derived from the Latin word codicillus, a little book or writing) is an instrument made by a testator subsequently to his will, to which it is ancillary, and by which the dispositions contained in the will may be modified, cancelled, or otherwise altered. It is subject to the same rules as to execution and attestation as the will itself, of which it is considered to be a part, and the law regarding wills is in all respects the same as that affecting codicils.