+ If the package is using debhelper, the <tt>dh_makeshlibs</tt> should + automatically discover this need and add the trigger itself.
Is "itself" needed here? It sounds awkward to me. (But this might be due to my non-nativeness.)
+ Note this tag may trigger for packages built with debhelper before
This tag is about triggers, so I'd rather avoid using "trigger" in another sense. How about s/trigger/be emitted/?
-- Jakub Wilk