Grawlix lets you comment on Haskell documentation. It's still alpha quality, but it works. You can read more about the project on GitHub. Here's how to use it:

  1. Drag this bookmarklet to your bookmarks bar: Grawlix
  2. Go to some Haskell documentation on Hackage or Stackage. For example, Salve.
  3. Click on the bookmarklet in your bookmarks bar.
  4. The comment sections should load in. Pretty much nothing will have any comments yet.
  5. Type in a comment and click "Submit". You'll bounce through some redirects, including GitHub's OAuth. You should end up back on the page you were on.
  6. Click on the bookmarklet in your bookmarks bar again.
  7. Your comment should show up. Hooray!