def AddNodeVersionFlag(parser, hidden=False):
  """Adds a --node-version flag to the given parser."""
  help_text = """\
The Kubernetes version to use for nodes. Defaults to server-specified.

The default Kubernetes version is available using the following command.

  $ gcloud container get-server-config
"""

  return parser.add_argument('--node-version', help=help_text, hidden=hidden)