diff --git a/src/backend/datasources/LiveDataSource.h b/src/backend/datasources/LiveDataSource.h
index f545410d5..e856bf071 100644
--- a/src/backend/datasources/LiveDataSource.h
+++ b/src/backend/datasources/LiveDataSource.h
@@ -1,211 +1,210 @@
 /***************************************************************************
     File                 : LiveDataSource.h
     Project              : LabPlot
     Description          : File data source
     --------------------------------------------------------------------
     Copyright            : (C) 2017 Fabian Kristof (fkristofszabolcs@gmail.com)
     Copyright            : (C) 2017-2018 Alexander Semke (alexander.semke@web.de)
     Copyright            : (C) 2018 Stefan Gerlach (stefan.gerlach@uni.kn)
 
  ***************************************************************************/
 
 /***************************************************************************
  *                                                                         *
  *  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 LIVEDATASOURCE_H
 #define LIVEDATASOURCE_H
 
 #include "backend/spreadsheet/Spreadsheet.h"
 #include "backend/matrix/Matrix.h"
 
 #include <QtNetwork/QLocalSocket>
 #include <QSerialPort>
 #include <QTimer>
 
 class QString;
 class AbstractFileFilter;
 class QFileSystemWatcher;
 class QAction;
 class QTcpSocket;
 class QUdpSocket;
 class QFile;
 
 class LiveDataSource : public Spreadsheet {
 	Q_OBJECT
-	Q_ENUMS(FileType)
 	Q_ENUMS(SourceType)
 	Q_ENUMS(UpdateType)
 	Q_ENUMS(ReadingType)
 
 public:
 	enum SourceType {
 		FileOrPipe = 0,		// regular file or pipe
 		NetworkTcpSocket,	// TCP socket
 		NetworkUdpSocket,	// UDP socket
 		LocalSocket,		// local socket
 		SerialPort		// serial port
 	};
 
 	enum UpdateType {
 		TimeInterval = 0,	// update periodically using given interval
 		NewData			// update when new data is available
 	};
 
 	enum ReadingType {
-		ContinuousFixed = 0,	// read fixed number of samples (aka lines) using given sampleSize
-		FromEnd,		// read from end, from line lastLine-sampleSize, i.e. sampleSize number of lines
+		ContinuousFixed = 0,	// read continously sampleSize number of samples (lines)
+		FromEnd,		// read sampleSize number of samples (lines) from end
 		TillEnd,		// read until the end
 		WholeFile		// reread whole file
 	};
 
 	LiveDataSource(AbstractScriptingEngine*, const QString& name, bool loading = false);
 	~LiveDataSource() override;
 
 	void ready();
 
 	static QStringList supportedBaudRates();
 	static QStringList availablePorts();
 
 	void setFileType(const AbstractFileFilter::FileType);
 	AbstractFileFilter::FileType fileType() const;
 
 	UpdateType updateType() const;
 	void setUpdateType(UpdateType);
 
 	SourceType sourceType() const;
 	void setSourceType(SourceType);
 
 	ReadingType readingType() const;
 	void setReadingType(ReadingType);
 
 	int sampleSize() const;
 	void setSampleSize(int);
 
 	void setBytesRead(qint64 bytes);
 	int bytesRead() const;
 
 	int port() const;
 	void setPort(quint16);
 
 	bool isPaused() const;
 
 	void setSerialPort(const QString& name);
 	QString serialPortName() const;
 
 	QString host() const;
 	void setHost(const QString&);
 
 	int baudRate() const;
 	void setBaudRate(int);
 
 	void setUpdateInterval(int);
 	int updateInterval() const;
 
 	void setKeepNValues(int);
 	int keepNValues() const;
 
 	void setKeepLastValues(bool);
 	bool keepLastValues() const;
 
 	void setFileWatched(bool);
 	bool isFileWatched() const;
 
 	void setFileLinked(bool);
 	bool isFileLinked() const;
 
 	void setFileName(const QString&);
 	QString fileName() const;
 
 	void setLocalSocketName(const QString&);
 	QString localSocketName() const;
 
 	void updateNow();
 	void pauseReading();
 	void continueReading();
 
 	void setFilter(AbstractFileFilter*);
 	AbstractFileFilter* filter() const;
 
 	QIcon icon() const override;
 	QMenu* createContextMenu() override;
 	QWidget* view() const override;
 
 	void save(QXmlStreamWriter*) const override;
 	bool load(XmlStreamReader*, bool preview) override;
 
 private:
 	void initActions();
 	void watch();
 
 	QString m_fileName;
 	QString m_serialPortName;
 	QString m_localSocketName;
 	QString m_host;
 
 	AbstractFileFilter::FileType m_fileType;
 	UpdateType m_updateType;
 	SourceType m_sourceType;
 	ReadingType m_readingType;
 
 	bool m_fileWatched;
 	bool m_fileLinked;
 	bool m_paused;
 	bool m_prepared;
 
 	int m_sampleSize;
 	int m_keepNValues;	// number of values to keep (0 - all)
 	int m_updateInterval;
 	quint16 m_port;
 	int m_baudRate;
 
 	qint64 m_bytesRead;
 
 	AbstractFileFilter* m_filter;
 
 	QTimer* m_updateTimer;
 	QFileSystemWatcher* m_fileSystemWatcher;
 
 	QFile* m_file;
 	QLocalSocket* m_localSocket;
 	QTcpSocket* m_tcpSocket;
 	QUdpSocket* m_udpSocket;
 	QSerialPort* m_serialPort;
 	QIODevice* m_device;
 
 	QAction* m_reloadAction;
 	QAction* m_toggleLinkAction;
 	QAction* m_showEditorAction;
 	QAction* m_showSpreadsheetAction;
 	QAction* m_plotDataAction;
 
 public slots:
 	void read();
 
 private slots:
 	void watchToggled();
 	void linkToggled();
 	void plotData();
 
 	void readyRead();
 
 	void localSocketError(QLocalSocket::LocalSocketError);
 	void tcpSocketError(QAbstractSocket::SocketError);
 	void serialPortError(QSerialPort::SerialPortError);
 };
 
 #endif