add comment about why sudo -k is necessary
add comment about why sudo -k is necessary

cinchapi/concourse,kylycht/concourse,cinchapi/concourse,dubex/concourse,dubex/concourse,dubex/concourse,dubex/concourse,dubex/concourse,kylycht/concourse,cinchapi/concourse,kylycht/concourse,kylycht/concourse,kylycht/concourse,cinchapi/concourse,kylycht/concourse,dubex/concourse,cinchapi/concourse,cinchapi/concourse