-Every line defines the mapping between device attributes and the name of
-the device file. It starts with a keyword defining the method for
-overriding the default kernel naming scheme, followed by a list
-of keys and ends with the definition of the filename for the device.
+Every line defines the mapping between device attributes and the device file
+name. It starts with a keyword defining the method used to match, followed by
+one ore more keys to compare and the filename for the device. If no matching
+configuration is found, the default kernel device name is used.
+.P
+The line format is:
+.RS
+.sp
+.I method, key,[key,...] name
+.sp
+.RE
+where valid methods with corresponding keys are: