diff --git a/.config/dotnet-tools.json b/.config/dotnet-tools.json
new file mode 100644
index 0000000..b8ef32e
--- /dev/null
+++ b/.config/dotnet-tools.json
@@ -0,0 +1,12 @@
+{
+  "version": 1,
+  "isRoot": true,
+  "tools": {
+    "csharpier": {
+      "version": "0.24.2",
+      "commands": [
+        "dotnet-csharpier"
+      ]
+    }
+  }
+}
\ No newline at end of file
diff --git a/Gremlin_BlazorServer/Pages/Quotes/QuoteAdd.razor.cs b/Gremlin_BlazorServer/Pages/Quotes/QuoteAdd.razor.cs
index 37c715f..c0fba7a 100644
--- a/Gremlin_BlazorServer/Pages/Quotes/QuoteAdd.razor.cs
+++ b/Gremlin_BlazorServer/Pages/Quotes/QuoteAdd.razor.cs
@@ -16,7 +16,7 @@ public partial class QuoteAdd {
 	private readonly CultureInfo cultureInfo = new("de-DE");
 	private const bool debug = true;
 
-	private IList<Contact> contacts = new List<Contact>();
+	private readonly IList<Contact> contacts = new List<Contact>();
 	private bool isCreatingPdf;
 	private bool isCreatingTex;
 	private bool lineItemsNotReady = true;