diff --git a/README b/README
index 6ce0418..79150dc 100644
--- a/README
+++ b/README
@@ -1,4 +1,4 @@
-usage : tty-clock [-sSctrvih] [-C [0-7]] [-f format]
+usage : tty-clock [-sSbctrnvih] [-C [0-7]] [-f format] [-T tty]
     -s            Show seconds
     -b            Show box                                       
     -S            Screensaver mode