The 25-year-old made his 50th appearance for The Reds last season and has now agreed to remain at The City Ground for two more years.
Smith came through the club’s ranks, signing as a seven-year-old, and gained first-team experience in loan spells at Ilkeston, Nuneaton Town, Barnsley and Mansfield and has now committed to being a part of Sabri Lamouchi’s squad.