diff --git a/commands/usbgadget.c b/commands/usbgadget.c
index 02c2c96..ba09f97 100644
--- a/commands/usbgadget.c
+++ b/commands/usbgadget.c
@@ -106,7 +106,8 @@
 BAREBOX_CMD_HELP_TEXT("Options:")
 BAREBOX_CMD_HELP_OPT ("-a",   "Create CDC ACM function")
 BAREBOX_CMD_HELP_OPT ("-s",   "Create Generic Serial function")
-BAREBOX_CMD_HELP_OPT ("-A <desc>",   "Create Android Fastboot function")
+BAREBOX_CMD_HELP_OPT ("-A [desc]",	"Create Android Fastboot function. If 'desc' is not provided,")
+BAREBOX_CMD_HELP_OPT ("",		"trying to use 'global.usbgadget.fastboot_function' variable.")
 BAREBOX_CMD_HELP_OPT ("-D <desc>",   "Create DFU function")
 BAREBOX_CMD_HELP_OPT ("-d",   "Disable the currently running gadget")
 BAREBOX_CMD_HELP_END