RE: Is it neccessary?
There's a better chance than not that your bow will need a minor adjustment. It's going to be a nock point issue, but not much else. Be certain that your arrow rest is ready to accomodate your longer draw. You may need to move it back, (the rest), or, depending on your arrow length, you may need longer shafts. After setting the nock height, check your point of impact at say, 10 yards. You don't want to accidentally send an arrow into the next zip code. Just sight back in and you'll be good to go.