Updatedb unrecognized option '--localpaths='

I am attempting to update a single directory I created. I'm using updatedb so it will be found by the locate command. Command used: updatedb --localpaths='/frodo/lib/modules/3.12.3-031203-generic/kernel' Output: updatedb: unrecognized option '--localpaths=/frodo/lib/modules/3.12.3-031203-generic/kernel' Same result with: updatedb --localpaths= updatedb: unrecognized option '--localpaths=' From man updatedb: > --localpaths='path1 path2...' > Non-network directories to put in the database. Default is /. **Why does it give this error when --localpaths is clearly stated as an option?** ---------- Sytem info: > updatedb --version > updatedb (mlocate) 0.26 > Copyright (C) 2007 Red Hat, Inc. All rights reserved. > This software is distributed under the GPL v.2. > > This program is provided with NO WARRANTY, to the extent permitted by law. > > lsb_release -a > LSB Version: core-2.0-amd64:core-2.0-noarch:core-3.0-amd64: > core-3.0-noarch:core-3.1-amd64:core-3.1-noarch:core-3.2-amd64:core-3.2- > noarch:core-4.0-amd64:core-4.0-noarch > Distributor ID: Ubuntu > Description: Ubuntu 13.10 > Release: 13.10 > Codename: saucy > > uname -r > 3.12.3-031203-generic ---------- Edit: I have had success with updatedb -U /frodo/lib/modules/3.12.3-031203-generic/kernel, but I would still like to know why the --localpaths from the manual is not recognized. This alternative option is not in the manual, but found with updatedb -h. > -U, --database-root PATH the subtree to store in database > (default "/")