diff --git a/app/models/note.rb b/app/models/note.rb
index 0597a28..cd7f3a8 100644
--- a/app/models/note.rb
+++ b/app/models/note.rb
@@ -23,9 +23,6 @@ class Note < ActiveRecord::Base
 
   enum kind: {invoice: 0, credit: 1, income: 2, reminder: 3}
 
-  # Notes should be immutable and never changed.
-  #validate :force_immutable
-
   before_create :generate_and_set_note_number
   before_create :generate_and_set_pdf
   before_update :generate_and_set_pdf
@@ -85,11 +82,4 @@ def generate_and_set_note_number
   def generate_and_set_pdf
     self.generated_pdf = generate_pdf
   end
-
-  def force_immutable
-    return unless changed? && persisted?
-
-    errors.add(:base, :immutable)
-    reload
-  end
 end
diff --git a/app/views/notes/_form.html.slim b/app/views/notes/_form.html.slim
index 164e86f..8583076 100644
--- a/app/views/notes/_form.html.slim
+++ b/app/views/notes/_form.html.slim
@@ -21,7 +21,7 @@
     = f.label :costs, class: 'label'
     table.table
       thead
-        th Datum
+        th Aantal
         th width='60%' Omschrijving
         th Bedrag
         th