Update comment on PrivateEncryptedChannelEventListener

Author: daniellevass

src/main/java/com/pusher/client/channel/PrivateEncryptedChannelEventListener.java

@@ -2,7 +2,9 @@
 
 /**
  * Interface to listen to private encrypted channel events.
- * Note: This needs to extend the PrivateChannelEventListener because of the ChannelManager clearDownSubscription
+ * Note: This needs to extend the PrivateChannelEventListener because in the
+ * ChannelManager handleAuthenticationFailure we assume it's safe to cast to a
+ * PrivateChannelEventListener
  */
 public interface PrivateEncryptedChannelEventListener extends PrivateChannelEventListener {