Button considered quitting F1 after 2015

The Briton only committed to a new contract for 2016 with the Woking team after weeks of uncertainty about his future plans.

Button conceded struggling at the back of the field all season made him think twice before deciding to stay on in F1.

"Last year I wasn't sure if I'd be racing and it wasn't my choice," Button told Sky Sports.

"This year it was totally my choice and there was a moment where I thought 'I not sure I want to do this anymore and be where we are'.

"Obviously if we are where we are right now next year, it is not going to be that enjoyable."

Although McLaren struggled in Honda's return to the sport - taking in the standings with just six points finishes - Button says he has been encouraged by Honda's plans to become competitive.

"I spent a lot of time with the engineers and the aerodynamicists and I spoke more with Ron [Dennis] in the two months when I was trying to decide what to do next year than I have in my whole time at McLaren," Button said.

"We went through a lot of ideas for next year and spoke to the aerodynamicists and the engineers and got a real direction and understanding of where we are going and with Honda as well.

"So that got me excited, that got me pumped for next year knowing that there are big improvements on the horizon and we need them."