If `wl-summary-lazy-highlight' is non-nil, 
    only visible portion of the buffer is colored.
 
+** Customizable biff notify.
+   New hook `wl-biff-notify-hook' and `wl-biff-unnotify-hook' is
+   now available.
+   e.g. (add-hook wl-biff-notify-hook 'ding)
+
+
 ** Many bug fixes.
 
 * Version 2.4.1 is basically a bug fix version of 2.4.0.
 
    \e$B?75,JQ?t\e(B wl-summary-lazy-highlight 
    non-nil \e$B$J$i%5%^%j$NI=<(ItJ,$N$_$r<+F0E*$K?'IU$1$7$^$9\e(B (Emacs \e$B$N$_\e(B)\e$B!#\e(B
 
+** biff \e$B$NDLCNJ}K!$,%+%9%?%^%$%:2DG=$K$J$j$^$7$?!#\e(B
+   \e$B?75,%U%C%/\e(B wl-biff-notify-hook, wl-biff-unnotify-hook \e$B$G@_Dj$G$-$^$9!#\e(B
+   \e$BNc\e(B: (add-hook wl-biff-notify-hook 'ding)
+
 ** \e$BB?$/$N%P%0%U%#%C%/%9\e(B
 
 * 2.4.1 \e$B$O\e(B 2.4.0 \e$B$N=$@5HG$G$9!#\e(B