diff --git a/notifier.graphql b/notifier.graphql
index 91c713d..eee5112 100644
--- a/notifier.graphql
+++ b/notifier.graphql
@@ -32,6 +32,15 @@ type NotificationsQueryResult {
     unread: Int!
 }
 
+type NotificationSeenResult {
+    error: String
+}
+
 type Query {
     loadNotifications(params: NotificationsQueryParams!): NotificationsQueryResult!
 }
+
+type Mutation {
+    markNotificationAsRead(notification_id: Int!): NotificationSeenResult!
+    markAllNotificationsAsRead: NotificationSeenResult!
+}