What legal principle allows for the modification of a will due to changed circumstances?

A codicil is a legal document that allows for the modification or addition to an existing will without having to create an entirely new will. It serves as an amendment to the original will and can address changes in circumstances, such as the birth of a child, changes in assets, or modifications to the wishes of the testator. By executing a codicil, the testator can ensure that their estate plan reflects their current intentions and circumstances.

In contrast, revocation refers to the complete annulment of a will, which does not allow for modifications but instead cancels the previous document altogether. A testamentary trust is a specific provision within a will that establishes a trust to manage and distribute assets, rather than modifying the will itself. Ademption occurs when a gift specified in a will is no longer part of the testator's estate at the time of their death, which also does not apply to changing or modifying the will based on new circumstances.