Darwin Fish - where are your feet?

Yes, as many of you have pointed out,  in last week's comic, the guy in the mirror has a Darwin Fish sign, but I neglected to put the little feet on the fish, which is admittedly the whole point of the Darwin Fish.

I'm not sure if I should correct this, and add the feet for version of the comic that goes in my archives for use in books, reprints, etc., or if I should leave the comic as originally published.  I've corrected small errors for the archives before, but this lies somewhere between correcting an error and making a substantive change.

Drop me an email if you have an opinion.