diff --git a/README.md b/README.md
index 08b34463..a8d1ab1f 100644
--- a/README.md
+++ b/README.md
@@ -82,12 +82,13 @@ $OAUTH_CLIENT_SECRET
 You can also set these values in your **configuration file**, `jupyterhub_config.py`:
 
 ```python
+# Replace MyOAuthenticator with your selected OAuthenticator class (e.g. c.GithubOAuthenticator).
+
 c.MyOAuthenticator.oauth_callback_url = 'http[s]://[your-host]/hub/oauth_callback'
 c.MyOAuthenticator.client_id = 'your-client-id'
 c.MyOAuthenticator.client_secret = 'your-client-secret'
 ```
 
-
 ## Azure Setup