Make my blog's search engine browse comments too

Hello,

WordPress internal search mechanics is somethign I never looked into before, so I’m new to this.
I’d like to change the behaviour of my blog, and make the search engine also browse the contents of the comments not just of the posts.

Please, would you know if there is a way to achieve this ? A hidden setting, or code hacking ?

Thank you very much if you can help ! ??