diff --git a/src/kdefrontend/datasources/MQTTSubscriptionWidget.h b/src/kdefrontend/datasources/MQTTSubscriptionWidget.h
index eb3d33772..7973b5794 100644
--- a/src/kdefrontend/datasources/MQTTSubscriptionWidget.h
+++ b/src/kdefrontend/datasources/MQTTSubscriptionWidget.h
@@ -1,77 +1,104 @@
+/***************************************************************************
+File                 : MQTTSubscriptionWidget.h
+Project              : LabPlot
+Description          : manage topics and subscribing
+--------------------------------------------------------------------
+Copyright            : (C) 2019 by Kovacs Ferencz (kferike98@gmail.com)
+***************************************************************************/
+
+/***************************************************************************
+*                                                                         *
+*  This program is free software; you can redistribute it and/or modify   *
+*  it under the terms of the GNU General Public License as published by   *
+*  the Free Software Foundation; either version 2 of the License, or      *
+*  (at your option) any later version.                                    *
+*                                                                         *
+*  This program 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 General Public License for more details.                           *
+*                                                                         *
+*   You should have received a copy of the GNU General Public License     *
+*   along with this program; if not, write to the Free Software           *
+*   Foundation, Inc., 51 Franklin Street, Fifth Floor,                    *
+*   Boston, MA  02110-1301  USA                                           *
+*                                                                         *
+***************************************************************************/
+
 #ifndef MQTTSUBSCRIPTIONWIDGET_H
 #define MQTTSUBSCRIPTIONWIDGET_H
 
 #include <QWidget>
 #include <QVector>
 
 #ifdef HAVE_MQTT
 #include "ui_mqttsubscriptionwidget.h"
 class QMqttSubscription;
 #endif
 
 class MQTTSubscriptionWidget : public QWidget {
 #ifdef HAVE_MQTT
     Q_OBJECT
 
 public:
     explicit MQTTSubscriptionWidget(QWidget* parent = nullptr);
     ~MQTTSubscriptionWidget() override;
     enum MQTTParentWidget {
         ImportFileWidget = 0,
         LiveDataDock = 1
     };
 
     void setTopicList (QStringList topicList);
     QStringList getTopicList();\
     int subscriptionCount();
     QTreeWidgetItem* topLevelTopic(int);
     QTreeWidgetItem* topLevelSubscription(int);
     void addTopic(QTreeWidgetItem*);
     int topicCount();
     void setTopicTreeText(const QString&);
     void makeVisible(bool);
     void testSubscribe(QTreeWidgetItem*);
     void testUnsubscribe(QTreeWidgetItem*);
 
 signals:
     void makeSubscription(const QString& name, quint8 QoS);
     void MQTTUnsubscribeFromTopic(const QString&, QVector<QTreeWidgetItem*> children);
     void removeMQTTSubscription(const QString&);
     void addBeforeRemoveSubscription(const QString&, quint8);
     void reparentTopic(const QString& topic, const QString& parent);
     void enableWill(bool);
 
 private:
     Ui::MQTTSubscriptionWidget ui;
     MQTTParentWidget m_parent;
     QWidget* m_parentWidget;
     QCompleter* m_subscriptionCompleter{nullptr};
     QCompleter* m_topicCompleter{nullptr};
     QStringList m_topicList;
     bool m_searching{false};
     QTimer* m_searchTimer;
 
     void unsubscribeFromTopic(const QString&);
     void manageCommonLevelSubscriptions();
     void updateSubscriptionCompleter();
 
 private slots:
     void mqttAvailableTopicDoubleClicked(QTreeWidgetItem* item, int column);
     void mqttSubscribedTopicDoubleClicked(QTreeWidgetItem* item, int column);
     void mqttSubscribe();
     void mqttUnsubscribe();
     void setTopicCompleter(const QString&);
     void scrollToTopicTreeItem(const QString& rootName);
     void scrollToSubsriptionTreeItem(const QString& rootName);
     void topicTimeout();
     void updateSubscriptionTree(const QVector<QString>&);
     void clearWidgets();
     void onDisconnect();
 
 
 
 #endif	// HAVE_MQTT
 };
 
 
 #endif // MQTTSUBSCRIPTIONWIDGET_H