I have some code to document (more complicated than that below). I'm probably going to use a combination of graphic callouts (lines running from the code to boxes with description) and regular comments. I will be using this code in a classroom and discussing parts of it with the participants. Does the color help? BTW, my brother is colorblind so I understand that it won't help everyone. I will be happy if it helps some. 
#use strict
my $foo;

while(<>){
        print func($_);
        $foo++;
}
print $foo;
--traveler

In reply to Documenting code by traveler

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