diff --git a/app/models/spree/calculator/sysmocom_mail_value_calculator.rb b/app/models/spree/calculator/sysmocom_mail_value_calculator.rb
index b6d3cd2..fd9cb72 100644
--- a/app/models/spree/calculator/sysmocom_mail_value_calculator.rb
+++ b/app/models/spree/calculator/sysmocom_mail_value_calculator.rb
@@ -24,18 +24,21 @@ module Spree
         shipping_value = total_value_no_tax(object)
         iso_code = extract_iso_code(object)
 
+        # Warenpost International Unterschrift S: 6.20 / M: 9.50 / L: 19.50
         base = 9.5
         if iso_code == 'DE'
+          # Grossbrief Einschreiben: 3.95;  Maxibrief Einschreiben: 5.10 / 7.30
           base = 5.1
         end
 
         # We need to add insurance..
-        if shipping_value < 30
+        if shipping_value < 20
           # Plain registered letter
           return base
         end
 
-        return base + (((shipping_value.round / 100) + 1) * 2)
+        # Wert Intenational: 2.50 + 2 EUR je 100 EUR Haftungssumme
+        return base + 2.5 + (((shipping_value.round / 100) + 1) * 2)
     end
 
   end