It really depends.

Within the same day or so, it’s usually sufficiently to update in situ. Your update will be seen anyway. If you specifically want someone who has replied to you prior to the update to see the changes, simply /msg them.

If you want to update a long dormant node, the best approach is probably:

1. Add <del></del> tags to the mistaken/obsolete parts of the node.
2. Post a reply with your update.
   • For root nodes, reply to yourself.
   • For non-root nodes, reply to the node your old node was in reply to, so that the author of that node will be notified of your new reply, should they have chosen that site option.
3. For the benefit of future visitors, add a notice to the old note, pointing to the new reply.

Makeshifts last the longest.