If your burgers are feeling a little blah, McDonald's is giving you a way to jazz them up -- for free.

The fast food chain is giving away 10,000 bottles of its Big Mac sauce today at participating restaurants.

The move is to celebrate the introduction of the Mac Jr. and the Grand Mac, two different-sized variations of the classic sandwich.

Want to snag a bottle? Here's where to find it around town:

5774 Buford Hwy NE, Doraville. 678-530-9992

1166 Ralph Abernathy Blvd. SW, Atlanta, 404-755-4489

4415 Wade Green Road NW, Kennesaw. 770-428-8493

When in the restaurant, customers must share the secret code "There's a Big Mac for that" to a crew member for a chance to get a bottle, which will be handed out on a first come, first serve basis. Those who aren't in a location where the bottles are being given away can still win a bottle by participating in McDonald's live giveaway on FacebookInstagram or Twitter.

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