## Is the fact that scipy.fft links to numpy.fft.fftpack.fft documented anywhere?

I couldn't find any official documentation of the fact that scipy.fft actually is a link to numpy.fft.fftpack.fft. Here is an iPython session showing the link:
In [1]: import scipy
In [2]: import numpy
In [3]: scipy.__version__
Out[3]: '0.19.0'
I...

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