I'm new to Stack Overflow and found a question where someone gave an answer that was not wrong in the first place but he missed some detail from the original question. What is now the correct way to react?

Should I add an answer and manually quote the part from the former answer to say my opinion to this? Or this there something else I can do? As far as I see, I'm not able to post comments now - but would this the best way? (So that I simply can't do anything at the moment?)

Edit:
To give a concrete example:
[xHTML: region (div) in a table](https://stackoverflow.com/questions/8727624/xhtml-region-div-in-a-table)

First answer from Rogier21 says s.th. about divs in td and that is fine. Correct answer - but the question asks for divs that are not in td. This is what I wanted to point out.