Update README.md

Author: dannys4

README.md

@@ -15,4 +15,6 @@ Interface:
 `fft(x::AbstractVector{<:Complex})`-- Forward FFT
 `fft(x::AbstractMatrix{<:Complex})`-- Forward FFT
 `bfft(x::AbstractVector{<:Complex})`-- Backward FFT (unscaled inverse FFT)
-`bfft(x::AbstractMatrix{<:Complex})`-- Backward FFT (unscaled inverse FFT)
+`bfft(x::AbstractMatrix{<:Complex})`-- Backward FFT (unscaled inverse FFT)
+
+NOTE: Currently, my C++ code is actually faster than this, so "Fastest Fourier Transform in my Apartment" is a bit of a misnomer.