17.810 text:increment (formulation)

<quote>
17.810 text:increment
The text:increment attribute causes line numbers to be numbered as multiples of a specified increment.
</quote>

what exactly does this mean? with an increment of 5, do consecutive lines get numbered 5, 10, 15, ...???

draft6 was much clearer on this:

<quote>
The text:increment attribute causes line numbers that are a multiple of the given increment to be numbered. For example, if the increment is 5, only lines number 5, 10, 15, and so on are numbered.
</quote>