README.md in acme-client-2.0.6 vs README.md in acme-client-2.0.7

@@ -182,10 +182,10 @@
 ```ruby
 csr = Acme::Client::CertificateRequest.new(private_key: a_different_private_key, subject: { common_name: 'example.com' })
 order.finalize(csr: csr)
 while order.status == 'processing'
   sleep(1)
-  challenge.reload
+  order.reload
 end
 order.certificate # => PEM-formatted certificate
 ```
 
 ## Extra