"I am sure he will prove to be an excellent addition to our squad," said Forest chairman Omar Al-Hasawi.
"I'm delighted to have signed a deal with Forest and I'm really looking forward to the task ahead," the striker told the club website.
"The history of the club sells itself and I had a chat with [manager] Sean O'Driscoll and liked what he had to say.
"I also met the chairman the other day and had a good look around the facilities and can tell it's a club going forward.
"One of the most important things for me were the assurances I was given by the owners. I've seen enough in football where owners come into the clubs, have a little flutter and then go away.
"I wanted to make sure that they are going to be here for the long haul and they assured me that they are. They have big plans for the club and I want to be a part of that."