diff --git a/docs/develop/ports/arm/urls.txt b/docs/develop/ports/arm/urls.txt
index f4537b0937..abaef44273 100644
--- a/docs/develop/ports/arm/urls.txt
+++ b/docs/develop/ports/arm/urls.txt
@@ -3,3 +3,6 @@ http://www.denx.de/wiki/U-Boot/UBootFdtInfo
 http://wiki.freebsd.org/FlattenedDeviceTree#Supporting_library_.28libfdt.29
 http://elinux.org/images/4/4e/Glikely-powerpc-porting-guide.pdf
 http://ols.fedoraproject.org/OLS/Reprints-2008/likely2-reprint.pdf
+http://www.bsdcan.org/2010/schedule/events/171.en.html
+http://www.devicetree.org/ (unofficial bindings)
+http://elinux.org/Device_Trees