Mass. Gen. Laws ch. 110A, § 203A
(a) Each investment adviser registered under this chapter shall disseminate to each client or prospective client a document disclosing material facts. The document shall include information concerning:
(b) Each investment adviser and each of its representatives registered under this chapter shall disclose to each client before a purchase or sale is effected on behalf of the client:
(3) the existence of any compensation arrangement with an issuer or other third party with respect to the recommended transaction.
The disclosure shall be in writing if the purchase or sale was recommended in writing. The secretary may, by rule, permit a client to waive in writing, the right to a disclosure.