If you participate in a note conversation, you will be notified in Triage whenever there is a reply to that note. You can become participant in three ways:
You create a note
If you created the note you will be notified in Triage whenever there is a reply.
You are @mentioned in a note
If you are @mentioned in a note you will receive a Triage notification for the @mention, and then any future replies to that note.
You comment on a note
If you write a comment on a note you will be notified in Triage for any future replies on that note.