A codicil is an instruction that is added to a will after the main part of it has been written.
英汉词典释义
n.
遗嘱的附件
She add a codicil to her will just before she die.她临终前在遗嘱上加了附录。The content of a book or document exclusive of prefatory matter, codicils, indexes, or appendices.正文除去序言、补遗、索引和附录的书或文献的主要部分。
英英词典释义
Noun
1. a supplement to a will; a testamentary instrument intended to alter an already executed will