Mass. Gen. Laws ch. 106, § 9-518
(b) Contents of statement under subsection (a). An information statement under subsection (a) shall:
(1) identify the record to which it relates by:
(d) Contents of statement under subsection (c). An information statement under subsection (c) shall:
(1) identify the record to which it relates by:
(B) if the information statement relates to a record filed or recorded in a filing office described in section 9–501(a)(1):