diff --git a/src/repositories/ApiBasedRepository.ts b/src/repositories/ApiBasedRepository.ts
index 6195c88..6a24b7f 100644
--- a/src/repositories/ApiBasedRepository.ts
+++ b/src/repositories/ApiBasedRepository.ts
@@ -3,6 +3,7 @@ import { IEta, IOrderedStop, IRoute, IShuttle, IStop, ISystem } from "../entitie
 
 const baseUrl = "https://passiogo.com/mapGetData.php"
 
+// TODO: implement TTL functionality
 // TODO: add TTL values to everything
 // TODO: remove RepositoryDataLoader and UnoptimizedInMemoryRepository
 // TODO: make milliseconds (TTL) required on everything