In the documents detail page, we made a special section for knowledge rating. By doing so you can help others find the best knowhow fast and easy.
All you have to do is click the "up" or "down" arrow. "Up" meaning the info was good. "Down" meaning it was less helpful.

But there is more. When selecting one of both arrows, you will be presented with  options to illustrate what is strong or weak about the document.