The McRib is back, and McDonald’s wants to help you find one.

The pork sandwich isn’t available at all McDonald’s locations. To make sure you can hunt one down, the company has released a mobile app that shows you where it’s being served up—the McDonald’s McRib Finder. It’s an iMessage app that uses your location to show you where the nearest McRib is and lets you easily invite a friend to go get one with you.

Basically how it works is you open up the app in iMessage, and it shows you a map with your location, pinpointing each McDonald’s outpost where you can find a McRib. Clicking on the location marker will prompt you with an address and the option to send it to someone. The app also contains a handful of McRib-themed stickers.

Considering it’s an iMessage app, the McRib Finder only works on iPhones and iPads. Android users will just have to rely on the McRib Locator website.

According to Consumerist, the McRib will be available at participating locations through the rest of the year.