R.I. Gen. Laws § 34-18-25: Rules and regulations.

(a) A landlord, from time to time, may adopt a rule or regulation, however described, concerning the tenant’s use and occupancy of the premises. It is enforceable against the tenant only if:

(1) Its purpose is to promote the convenience, safety, or welfare of the tenants on the premises, preserve the landlord’s property from abusive use, or make a fair distribution of services and facilities held out for the tenants generally;

(2) It is reasonably related to the purpose of which it is adopted;

(3) It is sufficiently explicit in its prohibition, direction, or limitation of the tenant’s conduct to fairly inform the tenant of what he or she must or must not do to comply;

(4) It applies to all tenants in the premises in a fair manner;

(5) It is not for the purpose of evading the obligations of the landlord; and

(6) The tenant has notice of it at the time he or she enters into the rental agreement, or when it is adopted.

(b) If a rule or regulation is adopted after the tenant enters into the rental agreement that works a substantial modification of his or her bargain, it is not valid unless the tenant consents to it in writing.