If, in accordance with the provisions of this chapter and R.I.G.L. Title 45, Chapter 24, as amended in 1991, changes are made in district boundaries or other matter portrayed on the Official Zoning Map, such changes shall be entered on the Official Zoning Map within 90 days after the amendment has been approved by the Town Council, with an entry on the Official Zoning Map as follows: "on [date], by official action of the Town Council, the following change(s) were made on the Official Map: [brief description of nature of change]," which entry shall be signed by the Town Council President and attested by the Town Clerk. No amendment to this chapter which involves matter portrayed on the Official Zoning Map shall become effective until after such change and entry has been made on said map.