(defcustom debbugs-gnu-mail-backend 'gnus
"*The email backend to use for reading bug report email exchange.
-If this is 'gnus, the default, use Gnus.
-If this is 'rmail, use Rmail instead."
+If this is `gnus', the default, use Gnus.
+If this is `rmail', use Rmail instead."
:group 'debbugs-gnu
:type '(choice (const :tag "Use Gnus" 'gnus)
(const :tag "Use Rmail" 'rmail))