Proper French capitalisation

Hey!
I am not a French native speaker, so I need some help.
How do I properly capitalise this title: “Comment je suis devenu un traître”?
As far as I’ve seen in Style Guidelines, it is capitalised the way I did it above.
Thanks in advance!

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Yes, according to https://musicbrainz.org/doc/Style/Language/French, general rule applies here since it is a verb phrase.

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