Lewis Hamilton says his decision to only sign a one-year contract with Mercedes should not cause concern as he prioritises his drive for more diversity in Formula One.

It took until February before seven-time world champion Hamilton and Mercedes finally announced they had come to terms on a new contract.

The agreement was only for 2021, the last season before sweeping regulation changes come into the sport.

Hamilton, 36, insists there should be no doubts over his commitment.

The Briton also spoke of his passion to fight for change and equality in F1 and wider society.

That will serve as his main focus in a year where he could surpass Michael Schumacher outright with an eighth title.

"I'm kind of in a fortunate position where I've achieved most of the stuff I wanted to achieve up until this point, so there's no real need necessarily to plan too far ahead in the future," Hamilton said at the launch of Mercedes' new W12 car.

"I'm fully invested in this season and delivering. I still love what I do.

"We're living through an unusual period of time in life and I just wanted one year. Then we can talk about if we do more, and keep adding it [by] one if we have to.

"I chose to have a one-year deal, so I can see where we are at. It doesn't mean I'm not committed.

"What I'm really focused on - there was a lot of discussion around the diversity issue, what is important is that we are delivering."

Hamilton added: "I'm really proud of my team, I'm already seeing steps to see that progress. That's my driving force to make sure we continue to push for accountability.

"The main priority for 2021 - in the past it was about just winning championships. But now it's really pushing for making real change.

"Last year there was discussion about equality and inclusion and there was a lot of talk this year about pushing for diversity and really making sure that action is taken.

"That's at the core of the drive for me, but of course we exist to win. That is what all these guys and girls here are working towards, so that's my goal to deliver it for them."

Mercedes boss Toto Wolff echoed the comments of Hamilton and is not concerned about the short deal.

Wolff said: "No doubt about his commitment. First of all, he enjoys racing a lot. We enjoy working with each other and we discussed that a lot.

"But he’s absolutely right. The times change, new priorities for all of us in terms of the way we live, our health, he is very passionate about his initiatives against racism and inequality.

"Then we have this massive regulatory change in 2022 that is going to reshape what Formula One will be.

"I don't think this will play a role, but I think it's fair for a driver who has won seven championships to have the flexibility to decide what he wants to do in future.

"We have agreed that we want to pick up the discussions much earlier this year to avoid a situation like we had in 2020, to run out of time and be in the uncomfortable position that we have no time left before the beginning of the season."

The 2021 season is scheduled to get under way with the Bahrain Grand Prix on March 28.