README.md in easypost-4.9.0 vs README.md in easypost-4.10.0

@@ -157,7 +157,7 @@
 - `EASYPOST_PROD_API_KEY`
 
 Some tests may require an EasyPost user with a particular set of enabled features such as a `Partner` user when creating referrals. We have attempted to call out these functions in their respective docstrings. The following are required when you need to re-record cassettes for applicable tests:
 
 - `USPS_CARRIER_ACCOUNT_ID` (eg: one-call buying a shipment for non-EasyPost employees)
-- `PARTNER_USER_PROD_API_KEY` (eg: creating a referral user)
-- `REFERRAL_USER_PROD_API_KEY` (eg: adding a credit card to a referral user)
+- `PARTNER_USER_PROD_API_KEY` (eg: creating a referral customer)
+- `REFERRAL_CUSTOMER_PROD_API_KEY` (eg: adding a credit card to a referral customer)