diff --git a/api/spec/src/entitlements/entitlements.tsp b/api/spec/src/entitlements/entitlements.tsp
index b2babbc13..03d7bfabd 100644
--- a/api/spec/src/entitlements/entitlements.tsp
+++ b/api/spec/src/entitlements/entitlements.tsp
@@ -226,6 +226,13 @@ model EntitlementSharedFields {
   ...ResourceTimestamps;
   ...OmitProperties<EntitlementCreateSharedFields, "featureKey" | "featureId">;
 
+  /**
+   * Readonly unique ULID identifier.
+   */
+  @example("01ARZ3NDEKTSV4RRFFQ69G5FAV")
+  @visibility("read")
+  id: ULID;
+
   /**
    * The type of the entitlement.
    */