diff --git a/stoptime.rb b/stoptime.rb
index 6f02fcb..ebe0c78 100644
--- a/stoptime.rb
+++ b/stoptime.rb
@@ -1056,6 +1056,7 @@ module StopTime::Controllers
       invoice = Invoice.create(:number => number)
       invoice.customer = Customer.find(customer_id)
       invoice.company_info = CompanyInfo.last
+      invoice.include_specification = invoice.customer.time_specification
 
       # Handle the hourly rated tasks first by looking at the selected time
       # entries.
@@ -1143,6 +1144,7 @@ module StopTime::Controllers
     def post(customer_id, invoice_number)
       invoice = Invoice.find_by_number(invoice_number)
       invoice.paid = @input.has_key? "paid"
+      invoice.include_specification = @input.has_key? "include_specification"
       invoice.save
 
       redirect R(CustomersNInvoicesX, customer_id, invoice_number)
@@ -2040,6 +2042,12 @@ module StopTime::Views
               _form_input_checkbox("paid")
             end
           end
+          div.control_group do
+            label.control_label "Include specification?"
+            div.controls do
+              _form_input_checkbox("include_specification")
+            end
+          end
           div.form_actions do
             button.btn.btn_primary "Update", :type => :submit,
               :name => "update", :value => "Update"