Ask the Well Done Chef! Oiling Parchment Paper?

Gerri writes:

I have recipes that call for oiling both sides of parchment paper. Food doesn't stick to parchment paper, so why grease it? Is it to keep the paper flat? Thanks.

I have posted a video answer to Gerri's question over at my blog:
http://wp.me/pTzns-Q0

Thanks!