diff --git a/bootstrap.d/41-uboot.sh b/bootstrap.d/41-uboot.sh
index 80c8bb3..3389bef 100644
--- a/bootstrap.d/41-uboot.sh
+++ b/bootstrap.d/41-uboot.sh
@@ -73,12 +73,12 @@ if [ "$ENABLE_UBOOT" = true ] ; then
     printf "\narm_64bit=1" >> "${BOOT_DIR}/config.txt"
     sed -i "s|bootz|booti|g" "${BOOT_DIR}/uboot.mkimage"
   fi
-
+  
+  # instead of sd, boot from usb device
   if [ "$ENABLE_UBOOTUSB" = true ] ; then
     sed -i "s|mmc|usb|g" "${BOOT_DIR}/uboot.mkimage"
   fi
 
-
   # Set mkfile to use the correct mach id
   if [ "$ENABLE_QEMU" = true ] ; then
     sed -i "s/^\(setenv machid \).*/\10x000008e0/" "${BOOT_DIR}/uboot.mkimage"