diff --git a/lib/secretariat/invoice.rb b/lib/secretariat/invoice.rb
index 833114e..73c97ed 100644
--- a/lib/secretariat/invoice.rb
+++ b/lib/secretariat/invoice.rb
@@ -42,6 +42,7 @@ module Secretariat
     :due_amount,
     :paid_amount,
     :tax_calculation_method,
+    :notes,
     :attachments,
     keyword_init: true
   ) do
@@ -84,7 +85,7 @@ def taxes
           taxes[line_item.tax_percent].base_amount += BigDecimal(line_item.net_amount) * line_item.quantity
         end
       end
-      
+
       if tax_calculation_method == :VERTICAL
         taxes.values.map do |tax|
           tax.tax_amount = (tax.base_amount * tax.tax_percent / 100).round(2)
@@ -200,8 +201,13 @@ def to_xml(version: 1, validate: true)
                 xml.text(issue_date.strftime("%Y%m%d"))
               end
             end
-
+            Array(self.notes).each do |note|
+              xml['ram'].IncludedNote do
+                xml['ram'].Content note
+              end
+            end
           end
+
           transaction = by_version(version, 'SpecifiedSupplyChainTradeTransaction', 'SupplyChainTradeTransaction')
           xml['rsm'].send(transaction) do
 
diff --git a/test/invoice_test.rb b/test/invoice_test.rb
index b425517..91ce0eb 100644
--- a/test/invoice_test.rb
+++ b/test/invoice_test.rb
@@ -52,7 +52,8 @@ def make_eu_invoice(tax_category: :REVERSECHARGE)
         grand_total_amount: BigDecimal('29'),
         due_amount: 0,
         paid_amount: 29,
-        payment_due_date: Date.today + 14
+        payment_due_date: Date.today + 14,
+        notes: "This is a test invoice",
       )
     end
 
@@ -401,7 +402,7 @@ def test_simple_foreign_invoice_v2_taxexpempt
     rescue ValidationError => e
       puts e.errors
     end
-    
+
     def test_simple_foreign_invoice_v2_untaxed
       begin
         xml = make_foreign_invoice(tax_category: :UNTAXEDSERVICE).to_xml(version: 2)
@@ -561,7 +562,7 @@ def test_de_multiple_taxes_invoice_against_schematron_2
       end
       assert_equal [], errors
     end
-    
+
     def test_negative_de_invoice_against_schematron_1
       xml = make_negative_de_invoice.to_xml(version: 1)
       v = Validator.new(xml, version: 1)