diff --git a/commands/detect.c b/commands/detect.c
index fbce4eb..15055e7 100644
--- a/commands/detect.c
+++ b/commands/detect.c
@@ -82,6 +82,7 @@
 BAREBOX_CMD_HELP_USAGE("detect [OPTIONS] [devices]\n")
 BAREBOX_CMD_HELP_OPT  ("-l",  "list detectable devices\n")
 BAREBOX_CMD_HELP_OPT  ("-e",  "bail out if one device fails to detect\n")
+BAREBOX_CMD_HELP_OPT  ("-a",  "detect all devices\n")
 BAREBOX_CMD_HELP_END
 
 BAREBOX_CMD_START(detect)