Dear Maintainer,

the manpage for gbp import-orig is confusing regarding the
--upstream-signature option.
----------------------------------------------------------------
--upstream-signatures=[auto|on|off]
              Whether upstream signatures should be imported as  well
              (when using pristine-tar). no turns this off completely
              while yes always tries to import a signature (which can
              be  useful  if  you  want to fail if e.g. uscan did not
              fetch a signature). The default auto means to import  a
              signature file if present but do nothing otherwise.
----------------------------------------------------------------

While the first line mentions "on" and "off", the text below mentions "yes"
and "no".  However, "yes" won't work, only "on" works as intended. gbp will
silently skip the upstream signature when "yes" is used.

Regards,
Tino