Jenson Button insists he needed 'more information' before committing to McLaren-Honda for another season, saying he has 'real belief' he will be driving more competitive car in 2016.

The former champion officially quashed rumours of retirement by being confirmed with McLaren-Honda for another season ahead of this weekend's Russian Grand Prix.

It came after weeks of speculation regarding his future, firstly over whether McLaren would retain him and then whether Button himself wished to even stay.

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However, Button says he simply needed more clarification for the future direction of the McLaren-Honda project before putting pen to paper, saying he is satisfied the team is looking considerably stronger for 2016.

"I had thoughts about what direction I would take if I wasn't here next year and what I could possibly do but it wasn't in my mind very long. But there were things I needed more information on, where this team is going.

"That's why I spent a lot of time with Ron [Dennis] on the phone but also at the McLaren Technology Centre last week, spending a lot of time with engineers and aerodynamicists running through everything on the engine programme, and that's the reason I decided to say.

"There was a lot more to it in terms of understanding where the team was going and where I fitted into that. I had a really good week last week in the factory, very positive spending it with many key individuals within the team -- heads of department that are really going to make a difference next year.

"I have a real belief that it is going to be much better next year, which is good, from the car side and also the engine side. That's why I want to be here next year."