If there were something here to actually create that discrepant moment, something at the bottom of the text or in the comments from the OP which says "you've just eaten the onion" or similar, then I would have no problem. Then, it WOULD be educational, and an excellent reminder as you say. However, there is no such indicator from the OP. That means that people will not actually get the learning experience unless someone points it out in the comments. Hence, I point it out in the comments.