Stateless component descriptions are ignored if declaration is exported

If I do this, my docBlock component description works as expected:

``` js
/**
 * Description here.
 */
function myComponent() { .. }
export default myComponent;
```

However, in _this_ situation the description comes out blank:

``` js
/**
 * Description here.
 */
export default function myComponent() { .. }
```

Am I misunderstanding something, or is this a bug?
