- <para>The argument should be a unit type name such as
- <option>service</option> and <option>socket</option>, or a
- unit load state such as <option>loaded</option> and
- <option>masked</option>.
- </para>
-
- <para>If the argument is a unit type, when listing units,
- limit display to certain unit types. If not specified units
+ <para>The argument should be a comma separated list of unit
+ types such as <option>service</option> and
+ <option>socket</option>, or unit load states such as
+ <option>loaded</option> and <option>masked</option>
+ (types and states can be mixed).</para>
+
+ <para>If one of the arguments is a unit type, when listing
+ units, limit display to certain unit types. Otherwise units