diff --git a/internal/proto/metadata.proto b/internal/proto/metadata.proto
index 948b47cd..819a68b7 100644
--- a/internal/proto/metadata.proto
+++ b/internal/proto/metadata.proto
@@ -70,4 +70,7 @@ enum DeviceType {
   // The device is a ChromeOS device. ChromeOS can be a laptop, desktop, or
   // convertible (tablet + clamshell).
   DEVICE_TYPE_CHROMEOS = 7;
+
+  // The device is a foldable.
+  DEVICE_TYPE_FOLDABLE = 8;
 }