(CBC) - 'Wine-on-shelf' system has been in U.S. crosshairs for some time.

Under the new trilateral trade deal between Canada, the United States and Mexico, B.C.'s supermarket wine shelves could get a little more crowded.

In a pair of side letters to the United States-Mexico-Canada Agreement, which representatives from the three countries agreed to in principle Sunday, Canada and the U.S. agreed that wine sales on B.C. supermarket shelves would no longer be limited to just offerings from within the province.