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For inconsequential changes you can just edit it. For anything substantial ("I meant to say I disagree with..."), I've often seen an explicit notation: "Edited to add: ..." "Edit: ...", or the lik...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/3780 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
For inconsequential changes you can just edit it. For anything substantial ("I meant to say I _disagree_ with..."), I've often seen an explicit notation: "Edited to add: ..." "Edit: ...", or the like. If there have been relevant comments, you can include a timestamp for the edit so people will see it was after the comment. This is what I do.