The parsing for "Distance units" rule was implemented consistently with
<distance units> ::= = "feet" | "meters" | "statute miles" | "nautical miles"
<td class='confluenceTd'> "kilometers"</td>
But, in that specification you can read the following comment:
"this set of units is just an example. The real list of distance unit
must be developed"
Is necessary to check the specification in order to update the unit list.