suggestion for new edition

[Eric Hanchrow]

In the section on svn:externals, mention that the user doesn't need to
create the directory first, but that svn will create it for them the
first time they update.  I just helped a guy who was failing because
he was creating (and then "add"ing) the directory first, thinking he
had to.
-- 
Because he pays close attention, a Navy pilot can land a
40,000 lb. aircraft at 140 miles per hour on a pitching carrier
deck, at night, more safely than the average teenager can cut a
bagel.
        -- Paul Graham