diff --git a/schema.graphqls b/schema.graphqls
index 20106cc..b7634ef 100644
--- a/schema.graphqls
+++ b/schema.graphqls
@@ -27,6 +27,7 @@ type OrderedStop {
   routeId: ID!
   stop: Stop
   stopId: ID!
+  systemId: ID!
 }
 
 type Stop {