diff --git a/README.md b/README.md
index aa45c44..31645ec 100644
--- a/README.md
+++ b/README.md
@@ -3,6 +3,7 @@
  
 # examples
 ```shell
+ENABLE_UBOOT=true ./rpi2-gen-image.sh
 ENABLE_CONSOLE=false ENABLE_IPV6=false ./rpi2-gen-image.sh
 ENABLE_HARDNET=true ENABLE_IPTABLES=true /rpi2-gen-image.sh
 APT_SERVER=ftp.de.debian.org APT_PROXY="http://127.0.0.1:3142/" ./rpi2-gen-image.sh