The NHL will put cameras on the blue lines beginning in the playoffs to aid officials on offside calls when games matter most.

The decision was announced Monday on the first day of meetings among the league's general managers. Executive vice president of hockey operations Colin Campbell says the tweak should lead to more consistency and give officials another angle to review if an offside call is challenged following a goal.

The coach's challenge was added as a video-replay option along with the change to 3-on-3 overtime last year.