-option(FFTW "Use FFTW implementation of DFT." OFF)
-option(FFTW_PARALLEL "Use FFTW implementation of DFT." OFF)
-option(ASYNC "Default setting is on. Works only if OPENCV_CUFFT is not ON. Will enable C++ async directive." OFF)
+option(FFTW "Use FFTW implementation of FFT. If selected together with OPENCV_CUFFT then this option will not be used." OFF)
+option(FFTW_PARALLEL "Use parrallel implementation of FFTW without OpenMP." OFF)
+option(FFTW_OPENMP "Use parrallel implementation of FFTW with OpenMP." OFF)
+option(ASYNC "Works only if OPENCV_CUFFT is not ON. Will enable C++ async directive." OFF)