The addendum to the Order for Service or OFS, is a form used to document the addition or removal of weigh, services, or changes of dates after a moving contract is already signed, but before the service begins. The addendum is critical when customers have selected a binding estimate or not-to-exceed price since any changes to the services will invalidate the original estimate. Arpin RI can use an addendum or recreate a new estimate or order for service; whichever the customer requests.