diff --git a/demo/qml/chart.qml b/demo/qml/chart.qml
index 1c2bf09..557603d 100644
--- a/demo/qml/chart.qml
+++ b/demo/qml/chart.qml
@@ -14,11 +14,13 @@ Item {
         ValueAxis {
             id: axisX
             titleText: qsTr("time [s]")
+            labelFormat: "%.1f"
         }
 
         ValueAxis {
             id: axisY
             titleText: qsTr("electric potential [V]")
+            labelFormat: "%.1f"
         }
 
         LineSeries {
diff --git a/demo/rust/src/implementation/time_series.rs b/demo/rust/src/implementation/time_series.rs
index 69becbf..f41e0b8 100644
--- a/demo/rust/src/implementation/time_series.rs
+++ b/demo/rust/src/implementation/time_series.rs
@@ -18,7 +18,7 @@ impl TimeSeriesTrait for TimeSeries {
             emit: emit,
             list: Vec::new(),
         };
-        for i in 0..100 {
+        for i in 0..101 {
             let x = i as f32 / 10.;
             series.list.push(TimeSeriesItem {
                 time: x,
diff --git a/demo/src/main.cpp b/demo/src/main.cpp
index 0fd8d86..585337b 100644
--- a/demo/src/main.cpp
+++ b/demo/src/main.cpp
@@ -272,14 +272,14 @@ QWidget* createChartTab(Model* model) {
     chart->addSeries(cos);
 
     QValueAxis *axisX = new QValueAxis;
-    axisX->setLabelFormat("%i");
+    axisX->setLabelFormat("%.1f");
     axisX->setTitleText("time [s]");
     chart->addAxis(axisX, Qt::AlignBottom);
     sin->attachAxis(axisX);
     cos->attachAxis(axisX);
 
     QValueAxis *axisY = new QValueAxis;
-    axisY->setLabelFormat("%i");
+    axisY->setLabelFormat("%.1f");
     axisY->setTitleText("electric potential [V]");
     chart->addAxis(axisY, Qt::AlignLeft);
     sin->attachAxis(axisY);