diff -r 934b45916514 -r a2ef410db055 udev.rst
--- a/udev.rst	Wed Jan 29 22:52:32 2014 +0200
+++ b/udev.rst	Wed Jan 29 23:03:40 2014 +0200
@@ -12,6 +12,7 @@
  * http://reactivated.net/writing_udev_rules.html
  * http://wiki.debian.org/udev
  * https://wiki.archlinux.org/index.php/Udev
+ * http://www.crashcourse.ca/wiki/index.php/Udev
 
 Record udev events.
 ===================
@@ -32,3 +33,10 @@
 
   $ udevinfo -a -p $(udevinfo -q path -n /dev/sdc)
 
+Debugging udev rule.
+====================
+::
+
+  $ sudo udevadm trigger
+  $ sudo udevadm test $(udevadm info -n /dev/$DEV -q path)
+