diff --git a/cmd/Kconfig b/cmd/Kconfig
index f962bb7141..a9fb4eead2 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -1346,8 +1346,11 @@ config CMD_ROCKUSB
 config CMD_USB_MASS_STORAGE
 	bool "UMS usb mass storage"
 	select USB_FUNCTION_MASS_STORAGE
+	depends on BLK && USB_GADGET
 	help
-	  USB mass storage support
+	  Enables the command "ums" and the USB mass storage support to the
+	  export a block device: U-Boot, the USB device, acts as a simple
+	  external hard drive plugged on the host USB port.
 
 config CMD_PVBLOCK
 	bool "Xen para-virtualized block device"