+@subsection \e$B:9=P$7?M$NI=<(7A<0$K$D$$$F\e(B
+
+\e$B=q<05-9f\e(B @samp{%f} \e$B$O!"\e(B@code{wl-summary-from-function} \e$B$G;XDj$7$?4X?t$,JV$9CM$r\e(B
+\e$BI=<($7$^$9!#4X?t\e(B @code{wl-summary-default-from} \e$B$rMQ$$$k>l9g\e(B(\e$B%G%U%)%k%H\e(B)\e$B!"DL>o$O\e(B
+\e$B:9=P?M$rI=<($7$^$9$,!"%U%)%k%@L>$,\e(B @code{wl-summary-showto-folder-regexp}
+\e$B$K%^%C%A$7!"$+$D:9=P?M$,<+J,$G$"$k%a%C%;!<%8$K$D$$$F$O!"08@h$rI=<($7$^$9!#\e(B
+\e$B$^$?!"\e(B @code{wl-use-petname} \e$B$,\e(B Non-nil \e$B$N>l9g$K$O%Z%C%H%M!<%`$rMQ$$$FI=<($7$^$9!#\e(B
+
+\e$BNc$($P!"\e(B@samp{+backup} \e$B$G$O<+J,$,=P$7$?%a%C%;!<%8$K$D$$$F$O08@h$rI=<($7$?$$>l9g!"\e(B
+\e$B<!$N$h$&$K@_Dj$7$^$9!#\e(B
+
+@lisp
+(setq wl-summary-showto-folder-regexp "^\\+backup$")
+@end lisp
+
+