Updated Whisper Push Notifications (markdown)

Whisper-Push-Notifications.md

@@ -13,6 +13,8 @@ It is crucial to understand what is **Whisper Notification Service** is designed
 The crux here is not discovery, but once discovery of capable wnode happens, and `DeviceA` has a subscription, how to allow `DeviceB` to trigger notifications, all this w/o knowing much of which wnode is used, or details of `DeviceA`. And `ChatID` solves this issue elegantly (the beauty is that it works for both one-on-one and group chats).
 
 **Important Notes:**
+- It is important to understand that notification request messages go *along* the normal communication i.e. on `DeviceA` you send, say, encrypted message to `DeviceB` (so, only `DeviceB` can open envelope), at the same time you need to send a broadcast message encrypting it with **publicly known** notification protocol key (the same key used in discovery, see below).
+- So, messages are never exposed, but certain information does get exposed
 
 
 # Discovery