If you’re a Coca-Cola fan, you may have spotted a few special bottles every spring that sport a yellow bottle cap instead of the signature red caps. And no, this isn’t just a springtime glow-up—the yellow-capped bottles have a little something special about them. What’s inside is a different recipe of Coke that’s just for Passover, which begins on April 12 this year. (In fact, the writing on the bottle cap, in Hebrew, says essentially “Kosher for Passover.”)

The eight-day spring celebration, which commemorates the Israelites’ escape from slavery, has specific dietary requirements. People who celebrate follow stricter-than-usual Kosher rules, which require removing all leavened foods, such as bread and baked goods, or foods made from wheat, rye, barley, and oats—called chametz. And some Jewish people, such as Ashkenazi Jews, also avoid legumes, rice, and corn (known as kitniyot). That means standard-issue Coke is a no-go, since it is sweetened with corn syrup and an enzyme called alpha-amylase that comes from barley.

But Jewish fans of Coca-Cola don’t necessarily have to sacrifice their favorite drink for the holiday. To ensure that it meets the strict Kosher for Passover guidelines, that yellow-capped version of Coke features old-fashioned cane sugar to sweeten it instead. That means it’s basically a dupe of fan-favorite Mexican Coke (and technically, the original recipe for Coke)—but available at a bargain-basement price. While Mexican Cokes can run about $9 for four 12-ounce glass bottles, you can get a 2-liter (about 68-ounce) bottle of Kosher for Passover Coke for the same price as a corn-syrup 2-liter—about $4.

And the yellow cap just makes it easier for shoppers to spot the kind they need for their Passover celebrations (or to enjoy that sucrose-sweetened version, rather than the corn syrup).

While you may not find the yellow-capped Cokes at every grocery store, if you do happen to see them this spring—and you’re a fan of the sugar-sweetened variety—you may want to grab a bottle or three to enjoy.