The league will now allow NBC to select up to two games between weeks five and 10 to flex into the Sunday night slot.
Previously, NBC could only select games between weeks 11 and 16.
This will allow for more mid-season high profile match-ups, especially in a situation where a surprise team starts the season well.
The NFL will still select the week 17 Sunday night game one week before it its played, and all games set to air on cable, on Thursday, Saturday, and Monday nights, are not available to be flexed into Sunday night..
The League is also now allowing something called 'cross-flexing between CBS and Fox, which would allow Fox to air a game between two AFC teams or CBS, between two NFC teams to balance the TV schedule in certain weeks, if necessary.
This increased television scheduling flexibility should continue to increase prime time ratings for the league, which have gone up every season since NBC started carrying the Sunday night package in 2006.