diff --git a/recaptcha_enterprise/demosite/src/main/java/app/MainController.java b/recaptcha_enterprise/demosite/src/main/java/app/MainController.java
index 4918afad386..ece6afb1b73 100644
--- a/recaptcha_enterprise/demosite/src/main/java/app/MainController.java
+++ b/recaptcha_enterprise/demosite/src/main/java/app/MainController.java
@@ -318,6 +318,7 @@ public static ModelAndView comment() {
   }
 
   // Classify the action as BAD/ NOT_BAD based on conditions specified.
+  // See https://cloud.google.com/recaptcha/docs/interpret-assessment-website
   public static HashMap<String, String> checkForBadAction(Assessment assessmentResponse,
       String recaptchaAction) {
     String reason = "";