- <para>Match against the value of an environment key. Depending on
- the specified operation, this key is also used as an assignment.</para>
+ <para>Search the devpath upwards for a device with matching sysfs attribute values.
+ Up to five <option>SYSFS</option> keys can be specified per rule. All attributes
+ must match on the same device. Trailing whitespace in the attribute values is ignored,
+ if the specified match value does not contain trailing whitespace itself.</para>