diff --git a/src/entities/entities.ts b/src/entities/entities.ts
index 8d1f0ad..f98faa5 100644
--- a/src/entities/entities.ts
+++ b/src/entities/entities.ts
@@ -40,6 +40,7 @@ export interface IEta extends IEntityWithOptionalTimestamp {
   secondsRemaining: number;
   shuttleId: string;
   stopId: string;
+  systemId: string;
 }
 
 export interface IOrderedStop extends IEntityWithOptionalTimestamp {
@@ -48,5 +49,6 @@ export interface IOrderedStop extends IEntityWithOptionalTimestamp {
   routeId: string;
   stopId: string;
   position: number;
+  systemId: string;
 }