This question already has an answer here:
My "very low quality" flag of this answer has been declined, with a note that
The correct procedure here is to comment, down-vote or even edit.
I don't think there is much to comment on an answer consisting of a single word, hyperlinked to the correct page. What could my comment possibly say? "Please embed your link into a better answer"?
Downvoting this answer would be inappropriate, too, because the link leads you to the correct page.
Finally, editing a single-word answer is very much like making a stone soup - it is the same as writing a brand-new answer.
Should there be a rule that all answers consisting of a single link without meaningful explanation be considered very low quality?