The New York Matrimonial Addendum (UCS-840M) is a form that is used to amend the terms of a prenuptial agreement or other matrimonial agreement in the State of New York. It is available from the New York State Unified Court System (UCS) and is also known as Form UCS-840M. The form must be completed and signed by both parties to the agreement and notarized in order to be valid. It is important to note that the form must be completed in English; there are no translations available. The New York Matrimonial Addendum (UCS-840M) comes in two different versions: an individual version and a joint version. The individual version must be completed by each party separately, while the joint version can be completed by both parties together. The form can be used to make changes to any part of a prenuptial agreement or other matrimonial agreement, such as the division of assets, spousal support, alimony, or other matters. It is important to note that the form does not include any provisions regarding child support or custody, so those must be included in separate documents.