The certainty that McLaren will be able to give him a car capable of fighting for the World Championship every season was key to Jenson Button's decision to commit his long-term future to the team, he says.
Button revealed to AUTOSPORT that even though there was interest from other teams for 2013, only McLaren gave him the confidence that it could give him a potentially title-winning car.
"I'm very confident here that I can help this team move forward and that they can give me what I need to fight for another World Championship," said Button. "Whether another team would do that, I don't know.
"Whether the circumstances would have ever been right in another team, I don't know. but I know what I have here and it's bloody good. Every year I am with this team, we will fight for the World Championship."
Button added that he is extremely comfortable in the McLaren environment, which also played a part in his decision to stay on for what is believed to be another three seasons.
"I fitted in very quickly at McLaren and I feel at home after a year and a half," he said.