Perhaps this should say:

- `updateOn`: string a space separated list of events; any of which should cause the model to be updated.
  There are two "special" events:
  - `default`: the standard built-in update event for this input (e.g. `change` or `input`).
  - `submit`: triggered when an enclosing form is submitted using `ngSubmit`. Note that this will not be triggered by `ngClick` on the `submit` button.