<p>If your followup question is really different, just ask a new question with a link to the older thread. I would say it is better to have some supporting data or updated context for this, so that it doesn't look like a duplicate. </p>

<p>You might also want to take a look at this related question: <a href="https://stats.meta.stackexchange.com/q/1259/930">What is the best way to ask a follow up or slightly revised question?</a></p>

<p>Re:</p>

<blockquote>
  <p>I feel like I should just add it to the comments but think no one will
  respond since the question is already answered.</p>
</blockquote>

<p>You can slightly edit your question so that it will bump up in the queue of active questions and upvote new comments so that they remain visible.</p>
