Two, I have a technique I teach to any new programmer, whether they're under my supervision or not: write the comments first. Programming courses always talk about writing pseudocode: why write it on scratch paper, just to throw it away?
That leads to the archetypical example of bad comments: 
    $counter ++;  # Increment the counter.

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Pseudocode gets replaced, not supplemented. It's thrown away because there's something better: the real code. Comments are not a replacement for pseudo-code.

In reply to Re^2: The art of comments: (rave from the grave) by Anonymous Monk
in thread The art of comments: (rave from the grave) by BrowserUk

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