cfft2b_() described as "2D FFT"

[Photosounder]

In fftpack.h the comments describe cfft2b_() as "2D FFT" and cfft2f_() as "2D IFFT". Isn't it the opposite, since b stands for backward and f for forward? The FORTRAN documentation states that CFFT2B "is known as the backward transform or Fourier synthesis, transforming from spectral to physical space", making it the IFFT.

Either way, bang up job, I'll soon be using cfftpack in one of my programs to speed up convolution between image layers.