diff --git a/config/initializers/cafe_grader_config.rb.SAMPLE b/config/initializers/cafe_grader_config.rb.SAMPLE
--- a/config/initializers/cafe_grader_config.rb.SAMPLE
+++ b/config/initializers/cafe_grader_config.rb.SAMPLE
@@ -28,3 +28,6 @@
 
 # Uncomment so that configuration is read only once when the server is loaded
 # CONFIGURATION_CACHE_ENABLED = true
+
+# Uncomment to allow authentication and user import from programming.in.th
+# LoginController.add_authenticator(ProgrammingAuthenticator.new)