diff --git a/MainWindow.axaml.cs b/MainWindow.axaml.cs
index 5a43984..95abbe8 100644
--- a/MainWindow.axaml.cs
+++ b/MainWindow.axaml.cs
@@ -355,10 +355,17 @@ public partial class MainWindow : Window
             //} catch (Exception ex) {}
     }
 
-    private void BtnClearCourseList_OnClick(object? sender, RoutedEventArgs e)
+    private async void BtnClearCourseList_OnClick(object? sender, RoutedEventArgs e)
     {
-        Settings.Instance.Sports.Clear();
-        RefreshCoursesList();
+        var result = await MessageBox.Show(this,
+            "Möchten Sie wirklich alle Kurse löschen?\n Dies kann nicht rückgängig gemacht werden.",
+            "Wirklich fortfahren?", MessageBoxButton.YesNo);
+        if (result == MessageBoxResult.Yes)
+        {
+            Settings.Instance.Sports.Clear();
+            RefreshCoursesList();    
+        }
+        
     }
 
     private void BtnDeleteSinleCourse_OnClick(object? sender, RoutedEventArgs e)