https://research.adfoucart.be/adding-context
If, after publication of a scientific paper, you want to add, edit, remove, comment on something, provide more context, expand on an idea, link to some things that you've done after, etc... there is no easy way to do that. Even voluntarily retracting an incorrect paper can take years, so going through that kind of editorial process for just a small comment would be ridiculous.
Fortunately, I can use my own website for that purpose: in addition to the PDF preprint that I already hosted, I have now added a HTML "annotated version" of all my papers, where I keep the original text intact but add sidenotes wherever I think it's relevant.
It's a small experiment on hopefully improving a little bit the way that we communicate our scientific results. I'm sure there are better ways to do it, but I like the freedom that these sidenotes provide, just scribbling in the margins as I'm re-reading through the text.