Update README.md

Co-authored-by: atymic <atymicq@gmail.com>

README.md

@@ -166,7 +166,9 @@ If this method is not present on your notification, the notification will *not*
 
 **Conditionally turn off scheduler**
 
-If you would like to turn off all notifications for your app, set an env variable of `SCHEDULED_NOTIFICATIONS_DISABLED` to `true` and it will turn off the auto scheduler. 
+If you would like to disable sending of scheduled notifications, set an env variable of `SCHEDULED_NOTIFICATIONS_DISABLED` to `true`. You will still be able to schedule notifications, and they will be sent once the scheduler is enabled.
+
+This could be useful for ensuring that scheduled notifications are only sent by a specific server, for example.
 
 ## Running the Tests