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It's bad etiquette to edit your comment after people have replied to it without showing what your edits were. Please do not do this.

Doesn't HN prevent that? I thought edits lock upon the first reply.

Weird, I dont have any edit option on my comment after you replied.

Maybe it's a karma-gated feature?

I don't think that it is karma-gated, but you can only edit the comment for two hours after it's posted. Then it's frozen.

Ah that makes sense.