pg_basebackup of local postgres with linked pg_xlog directory

The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/9.6/app-pgbasebackup.html
Description:

It would be nice to see documentation over the use case of creating a backup
file with pg_basebackup when there is a linked pg_xlog directory on the
localhost being backed up.

Thanks!
Joanna