+usage = """%prog [options] [<dir>]
+
+Export the applied patches into a given directory (defaults to
+'patches') in a standard unified GNU diff format. A template file
+(defaulting to '.git/patchexport.tmpl' or
+'~/.stgit/templates/patchexport.tmpl' or
+'/usr/share/stgit/templates/patchexport.tmpl') can be used for the
+patch format. The following variables are supported in the template
+file:
+
+ %(description)s - patch description
+ %(shortdescr)s - the first line of the patch description
+ %(longdescr)s - the rest of the patch description, after the first line
+ %(diffstat)s - the diff statistics
+ %(authname)s - author's name
+ %(authemail)s - author's e-mail
+ %(authdate)s - patch creation date
+ %(commname)s - committer's name
+ %(commemail)s - committer's e-mail
+
+'export' can also generate a diff for a range of patches."""