Loading css file

[Sir Osis of Liver]

I've added a css file to a custom theme in /css directory, it isn't loading.  Does it have to be called from somewhere?

[Illori]

index.template.php if it should be called on all pages for that theme.

[Sir Osis of Liver]

That's what I thought, but didn't find it.  Been sick and can barely see. 

Working now, thanks.