Massachusetts General Laws Part I. Administration of the Government (Ch. 1-182) Ch. 34, § 10

They shall keep a full and complete record of the proceedings at all their meetings and, if their vote or decision is not unanimous, the record shall show how each commissioner voted. A copy thereof, attested by their clerk, shall be transmitted annually, on or before the fifteenth day of January, to the director of accounts, who shall submit it to the general court.