R.I. Gen. Laws § 17-25-24

Any candidate eligible to receive public funds and electing to receive these funds whose opponent does not elect to receive public funds shall be permitted to raise additional private contributions and make additional expenditures for election purposes in an amount in excess of the candidate’s maximum allowable expenditure limit equal to the amount by which the expenditures of the opponent exceed the maximum allowable expenditure limit that would have applied to the opponent’s expenditures had the opponent elected to receive public funds.