R.I. Gen. Laws § 44-5-39.1: Recording required.

No tax provided for in § 44-5-39 constitutes a valid lien upon any parcel of real estate classified as farm, forest, or open space unless notice of the classification of the real estate has been filed by the tax assessor with the recorder of deeds of the city or town in which the real estate is located. There is no recording fee collected for the recording of the notice.