diff --git a/README.rst b/README.rst
index af52bfa3..27e93844 100644
--- a/README.rst
+++ b/README.rst
@@ -59,7 +59,7 @@ You will need to modify the ``ECOMMERCE_PAYMENT_PROCESSORS`` parameter to config
         flex_shared_secret_key: SET-ME-PLEASE
         soap_api_url: https://ics2wstest.ic3.com/commerce/1.x/transactionProcessor/CyberSourceTransaction_1.140.wsdl
         transaction_key: SET-ME-PLEASE
-        flex-run-environment: cybersource.environment.sandbox
+        flex_run_environment: cybersource.environment.sandbox
       paypal:
         cancel_checkout_path: /checkout/cancel-checkout/
         client_id: SET-ME-PLEASE