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How can I ask a clarification of a part of a old question that I don't understand?

For example:

I was reading this question

Best way to code Achievements system

but, in the middle of explanation there is a piece of code that I don't understand the reason

require '/badges/' . $file;
$badge = new $class;

I think that I could add a comment, but then it's probable that nobody see my comment (as the question is old), and I'm not sure that is good idea create a new related question.

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3  
Adding a bounty on the question is a great way to draw attention to it. –  Michael Petrotta Sep 5 '11 at 18:46
1  
If you add a comment, and if the asker is still around, he will get a notification about your comment, and might choose to answer. (Your particular question looks like not really like a question - most of it would be better in an answer, but there the same point would be valid.) –  PaĆ­lo Ebermann Sep 6 '11 at 1:29

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