Marlon, 26, joined from Nottingham Forest for £500,000 in November 2003 and was the clubs top goalscorer in all competitions last year netting 22 times.
He told the official site, “I'm delighted to have signed a new contract with the Club.
“The atmosphere and spirit within the squad is fantastic at the moment and I'm proud to be a part of the team.
”I've thoroughly enjoyed my time at the Club so far and winning promotion last season was without doubt one of the best moments of my career. Hopefully, we can look forward to more success like that in the future.
”We got off to a great start with the result against Blackburn on Saturday and it's given us a lot of confidence going into the trip to Newcastle. It's a great starting point for us to build on this season.”