diff --git a/recipes/additional-devices.md b/recipes/additional-devices.md
index 09e0b41..b41035a 100644
--- a/recipes/additional-devices.md
+++ b/recipes/additional-devices.md
@@ -18,7 +18,20 @@ To enable it execute this command as `root`:
 enable_dtoverlay eth1 ethernet@ff550000 okay
 ```
 
-This will enable `eth1` till next reboot. If you want to make it permamently consider adding this line to `/etc/rc.local` or other file that is executed on boot.
+This will enable `eth1` till next reboot. If you want to make it permamently execute this commands as `root`:
+
+### on SD card
+```
+fdtoverlay -i `ls /boot/dtb-*` -o /root/dtb-eth1 /sys/kernel/config/device-tree/overlays/eth1/dtbo
+mv /root/dtb `ls /boot/dtb-*`
+dtc -I dtb -O dts `ls /boot/dtb-*` > `ls /boot/dts-*`
+```
+
+### on eMMC
+```
+fdtoverlay -i /boot/dtbs/4.4.132-1075-rockchip-ayufan-ga83beded8524/rockchip/rk3328-rock64.dtb -o /root/dtb-eth1 /sys/kernel/config/device-tree/overlays/eth1/dtbo
+mv /root/dtb-eth1 /boot/dtbs/4.4.132-1075-rockchip-ayufan-ga83beded8524/rockchip/rk3328-rock64.dtb
+```
 
 ## Help wanted