1 files changed, 45 insertions, 0 deletions
diff --git a/newlib/libm/complex/cacosh.c b/newlib/libm/complex/cacosh.c
index 8f4f48ad3..3d42c407d 100644
--- a/newlib/libm/complex/cacosh.c
+++ b/newlib/libm/complex/cacosh.c
@@ -32,6 +32,51 @@
  * Marco Atzeri <marco_atzeri@yahoo.it>
  */
 
+/*
+FUNCTION
+        <<cacosh>>, <<cacoshf>>---complex arc hyperbolic cosine
+
+INDEX
+        cacosh
+INDEX
+        cacoshf
+
+ANSI_SYNOPSIS
+       #include <complex.h>
+       double complex cacosh(double complex <[z]>);
+       float complex cacoshf(float complex <[z]>);
+
+
+DESCRIPTION
+        These functions compute the complex arc hyperbolic cosine of <[z]>,
+        with a branch cut at values less than 1 along the real axis.
+
+        <<cacoshf>> is identical to <<cacosh>>, except that it performs
+        its calculations on <<floats complex>>.
+
+RETURNS
+        @ifnottex
+        These functions return the complex arc hyperbolic cosine value, 
+        in the range of a half-strip of non-negative values along the 
+        real axis and in the interval [-i * pi, +i * pi] along the 
+        imaginary axis.
+        @end ifnottex
+        @tex
+        These functions return the complex arc hyperbolic cosine value, 
+        in the range of a half-strip of non-negative values along the 
+        real axis and in the interval [$-i\pi$, $+i\pi$] along the 
+        imaginary axis.
+        @end tex
+
+PORTABILITY
+        <<cacosh>> and <<cacoshf>> are ISO C99
+
+QUICKREF
+        <<cacosh>> and <<cacoshf>> are ISO C99
+
+*/
+
+
 #include <complex.h>
 
 double complex