Kimi Raikkonen's book was the Finnish best-seller of 2018.
The 2007 world champion's official biography, written by Kari Hotakainen and called 'The Unknown Kimi Raikkonen', was hailed for its sensational revelations.
'Not such a big thing'
Ilta Sanomat newspaper reports that the book sold over 191 000 copies, making it "by far the best-selling book of 2018".
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"It's just something I decided to do," said the 2019 Sauber driver.
"It's not such a big thing in my view. I lived through it and it just happens to be now it's in a book," Raikkonen added.
Fernando Alonso, who has retired from Formula 1, has admitted that he will also write a biography.
"Yeah, next year I will," said the former McLaren driver.