Update cupyx/scipy/fft/fft.py
@@ -322,7 +322,7 @@ def irfft(x, n=None, axis=-1, norm=None, overwrite_x=False, *, plan=None):
axis (int): Axis over which to compute the FFT.
norm (None or ``'ortho'``): Normalization mode.
overwrite_x (bool): If True, the contents of ``x`` can be destroyed.
- plan (:class:`~cupy.cuda.cufft.Plan1d`) a cuFFT plan for transforming
+ plan (:class:`~cupy.cuda.cufft.Plan1d` or None) a cuFFT plan for transforming
``x`` over ``axis``, which can be obtained using::
plan = cupyx.scipy.fftpack.get_fft_plan(x, n, axis,
