diff --git a/doc.txt b/doc.txt
index 411150f..6cbacca 100644
--- a/doc.txt
+++ b/doc.txt
@@ -1,8 +1,8 @@
 # How to make a simple unikernel on RBPi
 
 File required on Raspberry Pi 5:
-- bcm2712-rpi-5-b.dtb
-- overlays/bcm2712d0.dtdo
+- bcm2712-rpi-5-b.dtb (https://github.com/raspberrypi/firmware/blob/master/boot/bcm2712-rpi-5-b.dtb)
+- overlays/bcm2712d0.dtbo (https://github.com/raspberrypi/firmware/blob/master/boot/overlays/bcm2712d0.dtbo)
 - config.txt
 
 CPU used by Raspberry Pi 5: Cortex-A76