- in which of these directories they live. Every line in the rules file contains at least
- one key value pair. There are two kind of keys, match and assignment keys.
+ in which of these directories they live.</para>
+
+ <para>Rule files are required to have a unique name, duplicate file names
+ are ignored. Files in <filename>/etc/udev/rules.d/</filename> have precedence
+ over files with the same name in <filename>/lib/udev/rules.d/</filename>. This
+ can be used to ignore a default rules file if needed.</para>
+
+ <para>Every line in the rules file contains at least one key value pair.
+ There are two kind of keys, match and assignment keys.