diff --git a/Devterm-CM3-ubuntu-server-image.md b/Devterm-CM3-ubuntu-server-image.md
index f581679..f366df2 100644
--- a/Devterm-CM3-ubuntu-server-image.md
+++ b/Devterm-CM3-ubuntu-server-image.md
@@ -1,6 +1,7 @@
 ubuntu-21.04-preinstalled-server-armhf+raspi.img
 
 ### Prepare
+Edit /boot/cmdline.txt and /etc/fstab of this img   
 **/boot/cmdline.txt**  
 ```
 console=serial0,115200 console=tty1 root=PARTUUID=78e1086a-02  rootfstype=ext4 elevator=deadline rootwait fixrtc splash