diff --git a/src/main.cpp b/src/main.cpp
index e2a2a1fb..dbf31d74 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,158 +1,159 @@
 /*
     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.
 
     ---
     Copyright (C) 2009 Alexander Rieder <alexanderrieder@gmail.com>
  */
 
 #include "cantor.h"
 #include <config-cantor.h>
 #include <QApplication>
 #include <KAboutData>
 #include <KCrash>
 #include <Kdelibs4ConfigMigrator>
 #include <KLocalizedString>
 #include <KConfigGroup>
 #include <KMessageBox>
 #include <QCommandLineParser>
 #include <QUrl>
 #include <QFileInfo>
 #include <QDir>
 
 static const char description[] =
     I18N_NOOP("KDE Frontend to mathematical applications");
 
 int main(int argc, char **argv)
 {
     QApplication app(argc, argv);
 
 #ifdef PATH_TO_CANTOR_PLUGINS
     // Add our custom plugins path, where we install our plugins, if it isn't default path
     const QString& path = QString::fromLocal8Bit(PATH_TO_CANTOR_PLUGINS);
     if (!QCoreApplication::libraryPaths().contains(path))
         QCoreApplication::addLibraryPath(path);
 #else
     qDebug() << "PATH_TO_CANTOR_PLUGINS variable is not set (probably a bug), so use the default library paths";
 #endif
 
     KCrash::initialize();
 
     // Migrating configuration from 4.x applications to KF5-based applications
     QStringList configFiles;
     QStringList rcFiles;
 
     configFiles << QLatin1String("cantorrc");
     rcFiles << QLatin1String("cantor_part.rc") << QLatin1String("cantor_scripteditor.rc")
             << QLatin1String("cantor_shell.rc") << QLatin1String("cantor_advancedplot_assistant.rc")
             << QLatin1String("cantor_differentiate_assistant.rc") << QLatin1String("cantor_import_package_assistant.rc")
             << QLatin1String("cantor_integrate_assistant.rc") << QLatin1String("cantor_create_matrix_assistant.rc")
             << QLatin1String("cantor_eigenvalues_assistant.rc") << QLatin1String("cantor_eigenvectors_assistant.rc")
             << QLatin1String("cantor_invert_matrix_assistant.rc") << QLatin1String("cantor_plot2d_assistant.rc")
             << QLatin1String("cantor_plot3d_assistant.rc") << QLatin1String("cantor_runscript_assistant.rc")
             << QLatin1String("cantor_solve_assistant.rc") << QLatin1String("cantor_qalculateplotassistant.rc");
 
     Kdelibs4ConfigMigrator migrator(QLatin1String("cantor"));
 
     migrator.setConfigFiles(configFiles);
     migrator.setUiFiles(rcFiles);
     migrator.migrate();
     //**********************************
 
     KLocalizedString::setApplicationDomain("cantor");
     app.setApplicationName(QLatin1String("cantor"));
     app.setOrganizationDomain(QLatin1String("kde.org"));
     app.setApplicationDisplayName(i18n("Cantor"));
     app.setWindowIcon(QIcon::fromTheme(QLatin1String("cantor")));
 
     KAboutData about(QLatin1String("cantor"),
                      QLatin1String("Cantor"),
                      QLatin1String(CANTOR_VERSION),
                      i18n(description),
                      KAboutLicense::GPL,
                      i18n("(C) 2016 Filipe Saraiva<br/>(C) 2009-2015 Alexander Rieder"),
                      QString(),
                      QLatin1String("http://edu.kde.org/cantor"));
 
     about.addAuthor( i18n("Filipe Saraiva"), i18n("Maintainer<br/>Qt5/KF5 port, Scilab and Python backends"), QLatin1String("filipe@kde.org"),
                      QLatin1String("http://filipesaraiva.info/") );
+    about.addAuthor( i18n("Nikita Sirgienko"), i18nc("@info:credit", "Developer"), QLatin1String("warquark@gmail.com>"));
+    about.addAuthor( i18n("Alexander Semke"), i18nc("@info:credit", "Developer"), QLatin1String("alexander.semke@web.de"));
     about.addAuthor( i18n("Alexander Rieder"), i18n("Original author<br/>Maintainer (2009 - 2015)"), QLatin1String("alexanderrieder@gmail.com") );
     about.addAuthor( i18n("Aleix Pol Gonzalez"), i18n("KAlgebra backend"), QLatin1String("aleixpol@kde.org") );
     about.addAuthor( i18n("Miha Čančula"), i18n("Octave backend"), QLatin1String("miha.cancula@gmail.com") );
-
     about.addAuthor( i18n("Martin Küttler"), i18n("Interface"), QLatin1String("martin.kuettler@gmail.com") );
 
     about.addCredit(QLatin1String("Andreas Kainz"), i18n("Cantor icon"), QLatin1String("kainz.a@gmail.com"));
     about.addCredit(QLatin1String("Uri Herrera"), i18n("Cantor icon"), QLatin1String("kaisergreymon99@gmail.com"),
                      QLatin1String("http://nitrux.in/"));
 
     QCommandLineParser parser;
     KAboutData::setApplicationData(about);
     parser.addVersionOption();
     parser.addHelpOption();
 
     const QCommandLineOption backendOption(QStringList()<<QLatin1String("b")<<QLatin1String("backend"), i18n("Use  backend <backend>"), QLatin1String("backend"));
     parser.addOption(backendOption);
 
     parser.addPositionalArgument(QStringLiteral("files"),  i18n("Documents to open."),  QStringLiteral("[files...]"));
 
 
     about.setupCommandLine(&parser);
     parser.process(app);
     about.processCommandLine(&parser);
 
     // see if we are starting with session management
     if (app.isSessionRestored())
         RESTORE(CantorShell)
     else
     {
         // no session.. just start up normally
 
         CantorShell *widget = new CantorShell();
         if ( parser.positionalArguments().count() == 0 )
         {
             if(parser.isSet(QLatin1String("backend")))
             {
                 widget->addWorksheet(parser.value(QLatin1String("backend")));
             }
             else
             {
                 widget->addWorksheet();
             }
         }
         else
         {
             const QStringList& args=parser.positionalArguments();
             for (const QString& filename : args)
             {
                 const QUrl url = QUrl::fromUserInput(filename, QDir::currentPath(), QUrl::AssumeLocalFile);
                 if (url.isValid())
                 {
                     if (url.isLocalFile() && !QFileInfo(url.toLocalFile()).exists())
                         KMessageBox::error(widget, i18n("Couldn't open the file %1", filename), i18n("Cantor"));
                     else
                     {
                         widget->addWorksheet(QLatin1String("null"));
                         widget->load(url);
                     }
                 }
             }
         }
         widget->show();
     }
 
     return app.exec();
 }