R.I. Gen. Laws § 34-22-2: Delivery and recording of disclaimer and renunciation.

Any renunciation or disclaimer shall be valid and effective according to its terms when signed by the person disclaiming or renouncing the power and delivered to any other person having any legal or equitable interest, vested or contingent, in the property subject to the power; provided, however, that if the property, or any part thereof, shall consist of real estate situated in this state, the disclaimer or renunciation shall not take effect with respect to the real estate unless and until the renunciation or disclaimer shall be acknowledged and recorded in the records of land evidence in the town or city in which the real estate, or some part thereof, is situated.