diff --git a/libnotificationmanager/declarative/notificationmanagerplugin.cpp b/libnotificationmanager/declarative/notificationmanagerplugin.cpp
index 4f3c93a44..0ef69cb54 100644
--- a/libnotificationmanager/declarative/notificationmanagerplugin.cpp
+++ b/libnotificationmanager/declarative/notificationmanagerplugin.cpp
@@ -1,47 +1,49 @@
 /*
  * Copyright 2018-2019 Kai Uwe Broulik <kde@privat.broulik.de>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) version 3, or any
  * later version accepted by the membership of KDE e.V. (or its
  * successor approved by the membership of KDE e.V.), which shall
  * act as a proxy defined in Section 6 of version 3 of the license.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 #include "notificationmanagerplugin.h"
 
 #include "notifications.h"
 #include "job.h"
 #include "server.h"
 #include "serverinfo.h"
 #include "settings.h"
 #include "watchednotificationsmodel.h"
 
 #include <QQmlEngine>
 
 using namespace NotificationManager;
 
 void NotificationManagerPlugin::registerTypes(const char *uri)
 {
     Q_ASSERT(uri == QLatin1String("org.kde.notificationmanager"));
 
     qmlRegisterType<Notifications>(uri, 1, 0, "Notifications");
     qmlRegisterUncreatableType<Job>(uri, 1, 0, "Job", QStringLiteral("Can only access Job via JobDetailsRole of JobsModel"));
     qmlRegisterType<Settings>(uri, 1, 0, "Settings");
     qmlRegisterSingletonType<Server>(uri, 1, 0, "Server", [](QQmlEngine *, QJSEngine *) -> QObject* {
         QQmlEngine::setObjectOwnership(&Server::self(), QQmlEngine::CppOwnership);
         return &Server::self();
     });
     qmlRegisterUncreatableType<ServerInfo>(uri, 1, 0, "ServerInfo", QStringLiteral("Can only access ServerInfo via Server"));
+
+    // WARNING: this is unstable API and does not provide any API or ABI gurantee for future Plasma releases and can be removed without any further notice
     qmlRegisterType<WatchedNotificationsModel>(uri, 1, 1, "WatchedNotificationsModel");
 }