It was a fitting performance with which to clinch the title.
He said: "During the race, I had no clue what they were going to decide with the points. So of course the main target was to win the race.
"Once I crossed the line, I was like 'OK that was an amazing race with good points again, but not world champion yet'.
"Then I did my interview after the race. And then suddenly my mechanics started to cheer and I was like, what's going on?
"And then I realised that Checo [Perez] was second instead of Charles, but I still didn't know if it was full points, half points or whatever.
"But then of course, you read through the rules. And the FIA came to me and said that I was the world champion.
"So then we celebrated but people were telling me no, you're still missing a point, and then it is amazing again - it was a bit weird.
"Eventually we had enough points. So then we were world champions again."