When a mortgage is assigned, extended, or otherwise dealt with, a memorial of the instrument shall be made upon the certificate of title. In case only a part of the mortgage upon the land is intended to be released or discharged a memorial of such partial release shall be entered.
Minn. Stat. § 508.56
(8302) RL s 3424; 1905 c 305 s 54; 1992 c 463 s 6; 1999 c 11 art 1 s 26