Chiefs are 63m under the cap

[NJChiefsFan]

As far as the roll over cap $ goes, allowing the Chiefs to be 30 million over the actual cap this year, what happens the next year? If the Chiefs signed a FA with the extra 30 million, they would still have to shed that to get under the cap the following year right? Basically, I am asking if this 30 million is only allowed for one year. That would make sense, and kind of makes you use it on 1 year contracts I would think.