diff --git a/src/services/NotificationService.ts b/src/services/NotificationService.ts
index 33533ba..2d9651f 100644
--- a/src/services/NotificationService.ts
+++ b/src/services/NotificationService.ts
@@ -56,15 +56,27 @@ export class NotificationService {
     return this._lastRefreshedTimeMs && Date.now() - this._lastRefreshedTimeMs < thirtyMinutesMs;
   }
 
+  /**
+   * Queue a notification to be sent.
+   * @param deviceId The device ID to send the notification to.
+   * @param shuttleId Shuttle ID of ETA object to check.
+   * @param stopId Stop ID of ETA object to check.
+   */
   public async scheduleNotification({ deviceId, shuttleId, stopId }: ScheduledNotificationData) {
 
   }
 
+  /**
+   * Cancel a pending notification.
+   * @param deviceId The device ID of the notification.
+   * @param shuttleId Shuttle ID of the ETA object.
+   * @param stopId Stop ID of the ETA object.
+   */
   public async cancelNotification({ deviceId, shuttleId, stopId }: ScheduledNotificationData) {
 
   }
 
-  public cancelAllNotifications() {
+  public cancelAllNotifications(deviceId: string) {
 
   }
 }