I found a question which I wanted to ask on Stack Overflow, the questioner has commented the answer on question itself.
Now I need a clarification on their comments, but as I don't have enough reputation to comment I can't comment there. So instead, I posted my comments in the answer field. Within a minute my post got deleted as it was obviously not an answer.
But everybody suggested to me that I ask a new question with a link to the existing question. Is this the correct way? Won't that create duplicate question?