diff --git a/src/controllers/NotificationsController.ts b/src/controllers/NotificationsController.ts
index a3f85ad..2153e85 100644
--- a/src/controllers/NotificationsController.ts
+++ b/src/controllers/NotificationsController.ts
@@ -53,6 +53,59 @@ export class NotificationsController {
 		h.send(list.map(this.NotifToAPI));
 	}
 
+	/**
+	 * Mark a notification as seen
+	 * 
+	 * @param h Request handler
+	 */
+	public static async MarkSeen(h: RequestHandler) {
+		const notifID = await this.PostNotifyID(h, "notifID")
+		const deleteSimilar = h.postBool("delete_similar", false)
+		
+		// Check if we are targetting a precise notification or
+		// an unfinite number of similar notifications
+		if(!deleteSimilar) {
+			await NotificationsHelper.Delete(new Notif({
+				id: notifID
+			}))
+		}
+
+		else {
+			// Get information about the notification
+			const notif = await NotificationsHelper.GetSingle(notifID);
+
+			await NotificationsHelper.Delete(new Notif({
+				onElemType: notif.onElemType,
+				onElemID: notif.onElemID,
+				destUserID: h.getUserId()
+			}));
+		}
+
+
+		h.success()
+	}
+
+	/**
+	 * The the ID of a notification included in a request
+	 * 
+	 * @param h Request handler
+	 * @param name The name of the post field
+	 */
+	private static async PostNotifyID(h: RequestHandler, name: string) {
+		const notifID = h.postInt(name);
+
+		// Check if the notification exists and targets the current user
+		const n = new Notif({
+			id: notifID,
+			destUserID: h.getUserId()
+		});
+
+		if(!await NotificationsHelper.SimilarExists(n))
+			h.error(404, "Specified notification not found!");
+		
+		return notifID;
+	}
+
 	/**
 	 * Transform a notification into an API entry
 	 * 
diff --git a/src/controllers/Routes.ts b/src/controllers/Routes.ts
index ab1ce7b..6c0a9d7 100644
--- a/src/controllers/Routes.ts
+++ b/src/controllers/Routes.ts
@@ -262,6 +262,8 @@ export const Routes : Route[] = [
 
 	{path: "/notifications/get_list_unread", cb: (h) => NotificationsController.GetListUnread(h)},
 
+	{path: "/notifications/mark_seen", cb: (h) => NotificationsController.MarkSeen(h)},
+
 
 
 	// Movies controller
diff --git a/src/entities/Notification.ts b/src/entities/Notification.ts
index 89f11f9..0bbcf02 100644
--- a/src/entities/Notification.ts
+++ b/src/entities/Notification.ts
@@ -54,7 +54,7 @@ export interface NotifBuilder {
 	fromUserID ?: number,
 	destUserID ?: number,
 	onElemID ?: number,
-	onElemType: NotifElemType,
+	onElemType ?: NotifElemType,
 	type ?: NotifEventType,
 	eventVisibility ?: NotifEventVisibility,
 	fromContainerID ?: number,
@@ -68,7 +68,7 @@ export class Notif implements NotifBuilder {
 	fromUserID ?: number;
 	destUserID ?: number;
 	onElemID ?: number;
-	onElemType: NotifElemType;
+	onElemType ?: NotifElemType;
 	type ?: NotifEventType;
 	eventVisibility ?: NotifEventVisibility;
 	fromContainerID ?: number;
diff --git a/src/helpers/NotificationsHelper.ts b/src/helpers/NotificationsHelper.ts
index 3058d6b..86f59c3 100644
--- a/src/helpers/NotificationsHelper.ts
+++ b/src/helpers/NotificationsHelper.ts
@@ -218,7 +218,7 @@ export class NotificationsHelper {
 	 * 
 	 * @param n The notification
 	 */
-	private static async SimilarExists(n: Notif) : Promise<boolean> {
+	public static async SimilarExists(n: Notif) : Promise<boolean> {
 		return await DatabaseHelper.Count({
 			table: NOTIFICATIONS_TABLE,
 			where: this.NotifToDB(n, false)
@@ -286,6 +286,25 @@ export class NotificationsHelper {
 		return list.map((e) => this.DBToNotif(e));
 	}
 
+	/**
+	 * Get information about a single notification
+	 * 
+	 * @param notifID Target notification id
+	 */
+	public static async GetSingle(notifID: number) : Promise<Notif> {
+		const row = await DatabaseHelper.QueryRow({
+			table: NOTIFICATIONS_TABLE,
+			where: {
+				id: notifID
+			}
+		});
+
+		if(row == null)
+			throw new Error("Could not find notification !");
+		
+		return this.DBToNotif(row);
+	}
+
 	/**
 	 * Turn a notification into a database entry
 	 *