Strange hole!!

Ok, so I just got my Aveo yesterday...so far...I love it. It's my first car that's mine so I'm pretty excited about it. Mine is an Aveo5 Hatchback '07 and I've realized that I have a hole...more of a slot actually...that I couldn't find in the owner's manual.

It's in the front driver's side door below the manual mirror control and left of the dash. It's about an inch and a half in length and about a centimeter across.

Mine is a pretty base model, nothing fancy, so I'm thinking it may be for something I don't have.

Just curious!

Awesome, thank you! Now to find something to put there...