you can notify users if the ticket is edited - but that kind of notification will send emails on any edit of the ticket.
If you want really specific notification - you can write or order event listener
https://developer.atlassian.com/display/JIRADEV/Writing+JIRA+Event+Listeners+with+the+atlassian-event+Libraryor create listener with script runner https://jamieechlin.atlassian.net/wiki/display/GRV/Listeners
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