diff --git a/stoptime.rb b/stoptime.rb
index aa22496..c2a8154 100644
--- a/stoptime.rb
+++ b/stoptime.rb
@@ -113,6 +113,7 @@ module StopTime::Models
   # [name] description (String)
   # [fixed_cost] fixed cost of the task (Float)
   # [hourly_rate] hourly rate for the task (Float)
+  # [invoice_comment] extra comment for the invoice (String)
   # [created_at] time of creation (Time)
   # [updated_at] time of last update (Time)
   #
@@ -447,6 +448,16 @@ module StopTime::Models
     end
   end
 
+  class InvoiceCommentsSupport < V 1.91 # :nodoc:
+    def self.up
+      add_column(Task.table_name, :invoice_comment, :string)
+    end
+
+    def self.down
+      remove_column(Task.table_name, :invoice_comment)
+    end
+  end
+
 end # StopTime::Models
 
 # = The Stop… Camping Time! controllers