Answer:
A codicil is another document that amends a will in some fashion. The amendment could be a simple as changing executors or more extensive like adding or dropping beneficiaries. I must be signed in the same way a will is signed. It doe not need to be witnessed by the same witnesses who witnessed the main will. Codicils are not very common any longer now that computer programs can reprint the main will in seconds. When wills were done on typewriters and the typing had to be perfect, a codicil was used to amend complicated wills.