Question about NFL rule

[aliazhar]

I am a football fan that has a rule related question about the NFL. I hope that this is the right forum to clear up my confusion about a rule. If it isn't, please let me know and I will not bother the members that are posting here. Ok, here is my question: I heard that the goal line of a football field extends out (as an imaginary line) from the out of bound marker so that a player doesn't necessarily have to get the ball to cross the plane of the goal line inside the pylon, and that as long as the player hasn't stepped out of bounds (and is diving in the air, for example) they will have scored a touchdown if the ball crosses the plane of that imaginary goal line that extends out of bounds. But that it is a common misconception among players that the ball has to cross the plane of the goal line inside the pylon, which is why they attempt to reach with the football when they are close to the goal line and are getting forced out of bounds. The source of this information was an announcer to a professional game. Can anyone point me in the direction of the rule book or confirm or deny this rule? Thanks. Loyal Fan.