Air breather filter?

I’m pretty sure that is going to turn out to be a very insignificant part, but, whatever. While buying a few other parts I stumbled upon an air breather filter for my 91 Buick LeSabre. It was only 2 dollars, so I picked it up. Only thing is, I don’t know where it goes (ok, so I haven’t opened up the air intake yet).

So, uh, where does it go? Google tells me very little.

It’s the filter for the PCV system, it will be inside your air cleaner assembly.