New sketch on plane, add a sketch point. add pierce relation to curve.
edit curve sketch, add sketch point, make coincident pierce or coincident to curve and coincident to plane.
Edit that sketch. Place a sketch point coincident with the curve and the plane.
What they said will work... ^^
Also you can create a new 3D sketch and add a point. Then make the point coincident to the curve and then make it "on plane" with your plane.