(CNN) - People can get free food at Chick-fil-A on Tuesday by dressing up like a cow.
The fast-food chain is celebrating its 13th annual "Cow Appreciation Day."
There are even some costume tips on the company's website. All adult customers have to do is show up in any type of cow attire, and they'll get a free entree.
Children who dress up will get a free kid's meal. Chick-fil-A calls Cow Appreciation Day its largest single-day customer appreciation event.
The giveaway will last until 7 p.m.
The promotion may not apply at all restaurants. Check local Chick-fil-A locations for participation and hours.
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