diff --git a/src/repositories/NotificationRepository.ts b/src/repositories/NotificationRepository.ts
index 6914bf8..8e6fdef 100644
--- a/src/repositories/NotificationRepository.ts
+++ b/src/repositories/NotificationRepository.ts
@@ -14,10 +14,18 @@ export interface ScheduledNotification extends NotificationLookupArguments {
   secondsThreshold: number;
 }
 
+export interface NotificationEvent {
+  notification: ScheduledNotification,
+  event: 'delete' | 'addOrUpdate'
+}
+
 export interface NotificationRepository {
   getAllNotificationsForShuttleAndStopId(shuttleId: string, stopId: string): Promise<ScheduledNotification[]>;
   getSecondsThresholdForNotificationIfExists(lookupArguments: NotificationLookupArguments): Promise<number | null>;
   isNotificationScheduled(lookupArguments: NotificationLookupArguments): Promise<boolean>;
   addOrUpdateNotification(notification: ScheduledNotification): Promise<void>;
   deleteNotificationIfExists(lookupArguments: NotificationLookupArguments): Promise<void>;
+
+  subscribeToNotificationChanges(listener: (event: NotificationEvent) => any): void;
+  unsubscribeFromNotificationChanges(listener: (event: NotificationEvent) => any): void;
 }