It might be a good idea to do so.
A simple reminder doesn't hurt.
It is like telling people to click the order button on a sales page.
I have started an article that had something like it built into the article but it is near the middle of the page. It is a comment that says hey if I am wrong tell me by leaving a comment at the bottom of the page. That is what it is there for.
This tactic might make a few people upset, but that would be the minority i would think.
It might be good to try it on a page or two and see what happens.
I really like the stop sign idea however. That is cleaver.