Minor typo in the docstring of `IdentityTransform`?

In `transforms.py`, I'm wondering if there wouldn't be a minor typo in this docstring:

``` python
class IdentityTransform(Affine2DBase):
    """
    A special class that does on thing, the identity transform, in a
    fast way.
    """
```

Shouldn't it be something like  `… that does on*e* thing,…` or `… that does nothing,…`?
