diff --git a/wp-includes/js/heartbeat.js b/wp-includes/js/heartbeat.js
index 5406459c85..c097973f13 100644
--- a/wp-includes/js/heartbeat.js
+++ b/wp-includes/js/heartbeat.js
@@ -1,14 +1,10 @@
 /**
  * Heartbeat API
  *
- * Note: this API is "experimental" meaning it will likely change a lot
- * in the next few releases based on feedback from 3.6.0. If you intend
- * to use it, please follow the development closely.
- *
  * Heartbeat is a simple server polling API that sends XHR requests to
  * the server every 15 - 60 seconds and triggers events (or callbacks) upon
  * receiving data. Currently these 'ticks' handle transports for post locking,
- * login-expiration warnings, and related tasks while a user is logged in.
+ * login-expiration warnings, autosave, and related tasks while a user is logged in.
  *
  * Available PHP filters (in ajax-actions.php):
  * - heartbeat_received