diff --git a/README.md b/README.md
index 4625045..06ece09 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,20 @@
 # Compulab RPI4-IOTG configuration
 
+## Install OS
+
+1. install rpiboot `sudo apt install rpiboot`
+2. start `sudo rpiboot`
+3. connect rpi to programming usb port, power on.
+
+The device should become available as removable drive (`lsblk`)
+
+
+
+compulab guide: [OS installation](https://mediawiki.compulab.com/w/index.php?title=IOT-GATE-RPI4:_Raspberry_Pi_OS_image_installation)
+
+
+## Add layers
+
 Files to update system to Buster
 
 Two options: