diff --git a/Devterm-CM3-ubuntu-server-image.md b/Devterm-CM3-ubuntu-server-image.md
index d9823bc..2bf6106 100644
--- a/Devterm-CM3-ubuntu-server-image.md
+++ b/Devterm-CM3-ubuntu-server-image.md
@@ -1,5 +1,17 @@
 ubuntu-21.04-preinstalled-server-armhf+raspi.img
 
+**/boot/cmdline.txt**  
+```
+console=serial0,115200 console=tty1 root=PARTUUID=78e1086a-02  rootfstype=ext4 elevator=deadline rootwait fixrtc splash
+```
+
+**/etc/fstab**  
+```
+PARTUUID=78e1086a-02   	   /         ext4   discard,errors=remount-ro       0 1
+PARTUUID=78e1086a-01       /boot/    vfat   defaults        0       1
+```
+
+
 ```
 sudo apt remove linux-image-raspi linux-image-5.11.0-1007-raspi -y
 sudo apt install net-tools network-manager -y