Is it OK to put link to SO questions in a program comments?

Posted by WizardOfOdds on Stack Overflow See other posts from Stack Overflow or by WizardOfOdds
Published on 2010-05-17T16:42:59Z Indexed on 2010/05/17 16:50 UTC
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In quite some codebase you can see comments stating things like:

 // Workaround for defect 'xxx', (See bug 1434594 on Sun's bugparade)

So I've got a few questions, but they're all related.

Is it OK to put link to SO questions in a program's comments:

 // We're now mapping from the "sorted-on column" to original indices.
 //
 // There's apparently no easy way to do this in Java, so we're
 // re-inventing a wheel.
 //
 // (see why here, in SO question: http://stackoverflow.com/questions/951848)

Do you do it?

And what are the drawbacks in doing so? (see my first comment for a terrible drawback)

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