diff --git a/UI/MainWindow.axaml b/UI/MainWindow.axaml
index b93ab89..f6a17f4 100644
--- a/UI/MainWindow.axaml
+++ b/UI/MainWindow.axaml
@@ -31,7 +31,10 @@
                 
                 <Menu Name="MenuBar" DockPanel.Dock="Top">
                     <MenuItem Header="_File">
-                        <MenuItem Name="DataFolderBtn" Header="_Open Data Folder..." Command="{Binding OpenDataHandler}" />
+                        <MenuItem Header="_Open Data Folder..." Command="{Binding OpenDataHandler}" />
+                    </MenuItem>
+                    <MenuItem Header="_Help">
+                        <MenuItem Header="_Data Guide" Command="{Binding OpenDataHOWTO}"/>
                     </MenuItem>
                 </Menu>
 
diff --git a/UI/MainWindow.axaml.cs b/UI/MainWindow.axaml.cs
index 5551b2a..197ae9e 100644
--- a/UI/MainWindow.axaml.cs
+++ b/UI/MainWindow.axaml.cs
@@ -46,4 +46,13 @@ public partial class MainWindow : Window
         Dialog.IsOpen = true;
         Dialog.DialogContent = new DataScanning().Content;
     }
+
+    public void OpenDataHOWTO()
+    {
+        var launcher = GetTopLevel(this)?.Launcher;
+        if (launcher != null)
+        {
+            launcher.LaunchUriAsync(new Uri("https://github.com/muskit/MercuryConverter/blob/main/HOWTO.md"));
+        }
+    }
 }
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