Just wondering if this can be made more clear:

```
The length of the returned tuple is not necessarily the same as :data:`Cube.ndim` as there may be dimensions on the cube without dimension coordinates. It is therefore unreliable to use the resulting tuple to identify the dimension coordinates for a given dimension - instead use the :meth:`Cube.coord` method with the ``dimensions`` and ``dim_coords`` keywords.
```

What do you think?