diff --git a/Devterm-CM3-rpi-os-image.md b/Devterm-CM3-rpi-os-image.md
index 82abaf7..9963558 100644
--- a/Devterm-CM3-rpi-os-image.md
+++ b/Devterm-CM3-rpi-os-image.md
@@ -8,7 +8,7 @@ https://downloads.raspberrypi.org/raspios_full_armhf/images/raspios_full_armhf-2
 - [x] Remove the wallpaper and change the solid color #202020  
 - [x] Install all rpi-related debs in the apt source 
 
-#### Packages in apt source
+#### Packages in devterm apt source
 1. devterm-audio-patch (check whether the 3.5 audio interface is plugged in, pull up a certain GPIO)
 1. devterm-fan-temp-daemon-rpi (detect the temperature of rpi, raise the io drive fan, written in python)
 1. devterm-kernel-rpi (modified kernel, 4.x series)
@@ -19,7 +19,8 @@ https://downloads.raspberrypi.org/raspios_full_armhf/images/raspios_full_armhf-2
 
 
 
-##### Add clockworkpi to /etc/hosts, then install devterm related apt, see https://github.com/clockworkpi/apt/tree/main/debian 
+##### Add clockworkpi to apt source list
+see https://github.com/clockworkpi/apt/tree/main/debian 
 ```
 wget -O - https://raw.githubusercontent.com/clockworkpi/apt/main/debian/KEY.gpg | sudo apt-key add -