closes #1689

1-js/11-async/02-promise-basics/article.md

@@ -272,6 +272,10 @@ let promise = new Promise(resolve => resolve("done!"));
 
 promise.then(alert); // done! (shows up right now)
 ```
+
+Note that this is different, and more powerful than the real life "subscription list" scenario. If the singer has already released their song and then a person signs up on the subscription list, they probably won't receive that song. Subscriptions in real life must be done prior to the event.
+
+Promises are more flexible. We can add handlers any time: if the result is already there, our handlers get it immediately.
 ````
 
 Next, let's see more practical examples of how promises can help us write asynchronous code.