README.md in active_merchant-epsilon-0.11.0 vs README.md in active_merchant-epsilon-0.12.0

@@ -305,10 +305,14 @@
 ### Epsilon Link Payment
 
 EpsilosLinkPaymentGateway is available in all link payments.
 For example, GMO Payment After Delivery.
 
+If you don't need to send paramaters of delivery information details(e.g. consignee_postal, consignee_name, orderer_postal, and orderer_name), you set `delivery_info_required` to `false`.
+
+Default value of `delivery_info_required` is `true`, therefore you must set delivery information details to purchase_detail When you don't set `delivery_info_required`.
+
 ```ruby
 ActiveMerchant::Billing::EpsilonLinkPaymentGateway.contract_code = 'YOUR_CONTRACT_CODE'
 
 gateway = ActiveMerchant::Billing::EpsilonLinkPaymentGateway.new
 
@@ -333,10 +337,12 @@
   orderer_tel:       '0312345678',
   memo1:             'memo1',
   memo2:             'memo2',
 }
 
-response = gateway.purchase(amount, purchase_detail)
+delivery_info_required = true
+
+response = gateway.purchase(amount, purchase_detail, delivery_info_required)
 
 if response.success?
   puts "Successfully send order data"
   puts "Redirect url is #{response.params['redirect']}"
 else