diff --git a/Documentation/applications/math/kissfft/index.rst b/Documentation/applications/math/kissfft/index.rst
index fcae4fd94e6..9ce5554cbb1 100644
--- a/Documentation/applications/math/kissfft/index.rst
+++ b/Documentation/applications/math/kissfft/index.rst
@@ -2,6 +2,11 @@
 ``kissfft`` KissFFT
 ===================
 
+KissFFT is a small open-source Fast Fourier Transform (FFT) library
+("Keep It Simple, Stupid") used in many embedded projects. It provides
+mixed-radix complex FFTs and a real-input helper, with floating-point
+or fixed-point types and a BSD license that is easy to vendor.
+
 ``apps/math/kissfft`` vendors `KissFFT
 <https://github.com/mborgerding/kissfft>`_ (tag ``v130``) and applies
 ``kissfft.patch``. It compiles ``kiss_fft.c`` and ``tools/kiss_fftr.c``.