Lack of documentation regarding parameter contig_break

After an honest try at figuring out what the contig_break parameter does I think I rather stop the guesswork and make an issue, perhaps other people using the tool will also find this information insightful. The explanation in the tool manual is hardly satisfying "Number of contiguous Ns to signify a break between contigs. Default is n=10". I am especially interested in knowing what the valid range of values that this parameter can take. Thank you in advance!