What is the equivalent of "void" in CFFI?

[oleg harput]

void InitWindow(int width, int height, const char *title);              in C

(cffi:defcfun ("InitWindow"
init-window)                                      in CFFI
    :void                       <==== This void is true or not?
  (width (:pointer :int))
  (heigh (:pointer :int))
  (title (:pointer :char)))

please help.
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