Notify user when post/comment is updated

Hey

I’d like to have a function on my WP-blog (https://www.boyer-draeby.dk) that notifies a user when a comment/posting is updated. Could someone point me to a plugin that allows users to selsect/click a function so that the user can get an email when the comment/post is updated ?

I’d like to allow the users to follow their own postings/comments or get notifications when specific other postings/comments are updated.

Make any sence ?
I would emagine a a little checkbox that user can click, saying “Notify me when this thread/post/comment is updated”, and letting them write their email?

Bueller Bueller .. Anyone.. anyone… ?

Regards
Jakob

https://www.boyer-draeby.dk