diff --git a/Create-DevTerm-CM4-OS-image-from-scratch.md b/Create-DevTerm-CM4-OS-image-from-scratch.md
index a13fdde..dd077f2 100644
--- a/Create-DevTerm-CM4-OS-image-from-scratch.md
+++ b/Create-DevTerm-CM4-OS-image-from-scratch.md
@@ -1,5 +1,6 @@
 ## Intro
-The image based on raspberry pi os   
+The image based on raspberry pi os  
+for raspberry pi cm4 with devterm cm4 adapter  
 and it is better to run a Ubuntu 21.04 in a VirtualBox to do all the jobs  
 The entire operation requires a certain experience in linux  
 be careful  
@@ -91,5 +92,3 @@ sudo losetup -D /dev/loop0 #assume loop0
 * Linux
 `sudo dd if=2021-05-07-raspios-buster-armhf-full.img of=/dev/sdX bs=8M status=progress`
 
-
-