If people get downvoted for posting a new reply to make sure the questioner gets alerted, then there should be an option to alert someone of a significant node update so he won't miss it.

Currently, the best way to handle a small but significant update is to both append the original post and create a new one, which is what I did. Appending the original will help people who've bookmarked it, and the new post will alert people who are just reading new replies.

In reply to Optional notification of significant edits by Wassercrats

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