Fortunately, HN has a feature to allow you to do that without polluting threads with useless comments: just click on the "timestamp" of the comment (next to the username) and then click on "favorite".
In the future, you can view all of your "favorite" comments from your profile page (click on your username in the top-rigtht of the page). As an added bonus, it's much easier than having to sift through your own comments to find that one specific thread you're looking for.
In the future, you can view all of your "favorite" comments from your profile page (click on your username in the top-rigtht of the page). As an added bonus, it's much easier than having to sift through your own comments to find that one specific thread you're looking for.