README.md in acme-client-2.0.13 vs README.md in acme-client-2.0.14

@@ -242,10 +242,10 @@
 To change the key used for an account you can call `#account_key_change` with the new private key or jwk.
 
 ```ruby
 require 'openssl'
 new_private_key = OpenSSL::PKey::RSA.new(4096)
-client.account_key_change(private_key: new_private_key)
+client.account_key_change(new_private_key: new_private_key)
 ```
 
 ## Requirements
 
 Ruby >= 2.1