(CNN) Will Ferrell and John C. Reilly have some tips on how to grow a moustache.

But don't worry, the video doesn't discriminate. The actors, who star in the upcoming Christmas comedy, "Holmes and Watson," also tell women the importance of growing facial hair.

"You do have a Movember moustache, don't you?" Ferrell says in the video. "I mean, what kind of idiot doesn't have a moustache?"

"Seriously, fellas, ladies, it's 2018. Everyone has to grow a moustache," says Reilly.

The duo made the video in support of Movember month, which aims to raise awareness and research funding for prostate and testicular cancer, as well as mental health care.

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