diff --git a/src/mainwindow.cpp b/src/mainwindow.cpp
--- a/src/mainwindow.cpp
+++ b/src/mainwindow.cpp
@@ -157,7 +157,7 @@ MainWindow::MainWindow(QWidget *parent) 
     for (unsigned int i = 0; i < numOfChannels; i++)
     {
         channelBuffers.append(new FrameBuffer(numOfSamples));
-        curves.append(new QwtPlotCurve());
+        curves.append(new QwtPlotCurve(QString("Channel %1").arg(i+1)));
         curves[i]->setSamples(channelBuffers[i]);
         curves[i]->setPen(Plot::makeColor(i));
         curves[i]->attach(ui->plot);
@@ -344,7 +344,7 @@ void MainWindow::onNumOfChannelsChanged(
         for (unsigned int i = 0; i < numOfChannels - oldNum; i++)
         {
             channelBuffers.append(new FrameBuffer(numOfSamples));
-            curves.append(new QwtPlotCurve());
+            curves.append(new QwtPlotCurve(QString("Channel %1").arg(oldNum+i+1)));
             curves.last()->setSamples(channelBuffers.last());
             curves.last()->setPen(Plot::makeColor(curves.length()-1));
             curves.last()->attach(ui->plot);
diff --git a/src/plot.cpp b/src/plot.cpp
--- a/src/plot.cpp
+++ b/src/plot.cpp
@@ -39,6 +39,7 @@ Plot::Plot(QWidget* parent) :
 
     zoomer.setZoomBase();
     grid.attach(this);
+    legend.attach(this);
 
     showGrid(false);
     darkBackground(false);
diff --git a/src/plot.h b/src/plot.h
--- a/src/plot.h
+++ b/src/plot.h
@@ -26,6 +26,7 @@
 #include <qwt_plot.h>
 #include <qwt_plot_grid.h>
 #include <qwt_plot_shapeitem.h>
+#include <qwt_plot_legenditem.h>
 
 #include "zoomer.h"
 #include "scalezoomer.h"
@@ -51,6 +52,7 @@ private:
     ScaleZoomer sZoomer;
     QwtPlotGrid grid;
     PlotSnapshotOverlay* snapshotOverlay;
+    QwtPlotLegendItem legend;
 
     QAction _showGridAction;
     QAction _showMinorGridAction;