A supplement or addition to a will that modifies, explains, or revokes provisions of the original will. It must be executed with the same formalities as a will to be valid.
From Latin 'codicillus,' diminutive of 'codex' (book, code), literally meaning 'little book.' Roman law used codicils as informal documents to supplement formal wills, later developing into the modern legal instrument.
A codicil is like a legal 'P.S.' to your will—instead of rewriting the entire document to make small changes, you can add a codicil to update beneficiaries, change gifts, or fix mistakes, but it must be signed with the same ceremony as the original will!
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