Multiple documents field?

Hi folks.

I´ve been asked to provide a document field on the Campaign record (they want to put their PoA´s and stuff connected to the campaign there). So, I can create a "Relate" field that connects to the Documents module, as such:

But what is the best practice for multiple documents?

Make multiple fields similar to the one above? Nah, that can´t be it.

Thanks,

KGM