diff --git a/src/dataformatpanel.cpp b/src/dataformatpanel.cpp
--- a/src/dataformatpanel.cpp
+++ b/src/dataformatpanel.cpp
@@ -183,7 +183,7 @@ void DataFormatPanel::enableDemo(bool en
 void DataFormatPanel::spsTimerTimeout()
 {
     unsigned currentSps = _samplesPerSecond;
-    _samplesPerSecond = sampleCount/SPS_UPDATE_TIMEOUT;
+    _samplesPerSecond = (sampleCount/_numOfChannels)/SPS_UPDATE_TIMEOUT;
     if (currentSps != _samplesPerSecond)
     {
         emit samplesPerSecondChanged(_samplesPerSecond);
diff --git a/src/defines.h b/src/defines.h
new file mode 100644
--- /dev/null
+++ b/src/defines.h
@@ -0,0 +1,20 @@
+/*
+  Copyright © 2016 Hasan Yavuz Özderya
+
+  This file is part of serialplot.
+
+  serialplot 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 3 of the License, or
+  (at your option) any later version.
+
+  serialplot 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 serialplot.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+const char* BUG_REPORT_URL = "https://bitbucket.org/hyOzd/serialplot/issues/new";
diff --git a/src/mainwindow.cpp b/src/mainwindow.cpp
--- a/src/mainwindow.cpp
+++ b/src/mainwindow.cpp
@@ -25,6 +25,7 @@
 #include <QFile>
 #include <QTextStream>
 #include <QMenu>
+#include <QDesktopServices>
 #include <QtDebug>
 #include <qwt_plot.h>
 #include <limits.h>
@@ -35,6 +36,7 @@
 
 #include "framebufferseries.h"
 #include "utils.h"
+#include "defines.h"
 #include "version.h"
 
 #if defined(Q_OS_WIN) && defined(QT_STATIC)
@@ -95,6 +97,9 @@ MainWindow::MainWindow(QWidget *parent) 
     QObject::connect(ui->actionHelpAbout, &QAction::triggered,
               &aboutDialog, &QWidget::show);
 
+    QObject::connect(ui->actionReportBug, &QAction::triggered,
+                     [](){QDesktopServices::openUrl(QUrl(BUG_REPORT_URL));});
+
     QObject::connect(ui->actionExportCsv, &QAction::triggered,
                      this, &MainWindow::onExportCsv);
 
@@ -205,7 +210,7 @@ MainWindow::MainWindow(QWidget *parent) 
 
     // Init sps (sample per second) counter
     spsLabel.setText("0sps");
-    spsLabel.setToolTip("samples per second (total of all channels)");
+    spsLabel.setToolTip("samples per second (per channel)");
     ui->statusBar->addPermanentWidget(&spsLabel);
     QObject::connect(&dataFormatPanel,
                      &DataFormatPanel::samplesPerSecondChanged,
diff --git a/src/mainwindow.ui b/src/mainwindow.ui
--- a/src/mainwindow.ui
+++ b/src/mainwindow.ui
@@ -250,6 +250,7 @@
      <string>Help</string>
     </property>
     <addaction name="actionDemoMode"/>
+    <addaction name="actionReportBug"/>
     <addaction name="actionHelpAbout"/>
    </widget>
    <widget class="QMenu" name="menuFile">
@@ -340,6 +341,14 @@
     <string>Ctrl+Q</string>
    </property>
   </action>
+  <action name="actionReportBug">
+   <property name="text">
+    <string>Report a Bug</string>
+   </property>
+   <property name="toolTip">
+    <string>Report a Bug on SerialPlot Website</string>
+   </property>
+  </action>
  </widget>
  <layoutdefault spacing="6" margin="11"/>
  <customwidgets>
diff --git a/src/plot.cpp b/src/plot.cpp
--- a/src/plot.cpp
+++ b/src/plot.cpp
@@ -154,6 +154,7 @@ void Plot::darkBackground(bool enabled)
         zoomer.setRubberBandPen(QPen(Qt::white));
         zoomer.setTrackerPen(QPen(Qt::white));
         sZoomer.setPickerPen(QPen(Qt::white));
+        legend.setTextPen(QPen(Qt::white));
     }
     else
     {
@@ -163,6 +164,7 @@ void Plot::darkBackground(bool enabled)
         zoomer.setRubberBandPen(QPen(Qt::black));
         zoomer.setTrackerPen(QPen(Qt::black));
         sZoomer.setPickerPen(QPen(Qt::black));
+        legend.setTextPen(QPen(Qt::black));
     }
     replot();
 }