diff --git a/man/backlight-notify.1 b/man/backlight-notify.1
index 0d748b3..2bee378 100644
--- a/man/backlight-notify.1
+++ b/man/backlight-notify.1
@@ -18,6 +18,8 @@ backlight-notify \(em ACPI Backlight notification
 
 .IP "\fB-h\fR, \fB--help\fR" 5
 Show help options
+.IP "\fB-b\fR, \fB--backlight\fR"
+Folder name in /sys/class/backlight/<backlight>
 .IP "\fB-d\fR, \fB--debug\fR" 5
 Enable debug information
 .IP "\fB-t\fR, \fB--timeout\fR" 5