swift auth --help is missing information

This bug is a derivative for bug #1621415.
While testing the fix for that bug I noticed that the help for the auth sub command is confusing and seems to be missing information:

[vagrant@server0 python-swiftclient]$ swift auth --help
Usage: swift auth Display auth related authentication variables in shell friendly format.

  Commands to run to export storage url and auth token into
  OS_STORAGE_URL and OS_AUTH_TOKEN:

      swift auth

  Commands to append to a runcom file (e.g. ~/.bashrc, /etc/profile) for
  automatic authentication:

      swift auth -v -U test:tester -K testing -A http://localhost:8080/auth/v1.0

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The Usage does not detail -v -U options.