affine2d's outputLimits - what does it do??

I really tried to understand what this function does, but alas, I failed... I thought it works like this:

[transformedXMinMax transformedYMinMax] = outputLimits(tform,[xMin xMax],[yMin yMax]);

But according to the example, it does not...

Does anyone know what it does?

[Cant Find]

Got it, thanks :) It returns the bounding box after applying the transformation on a given bounding box.