1 files changed, 53 insertions, 0 deletions
diff --git a/newlib/libm/complex/casinh.c b/newlib/libm/complex/casinh.c
index 693b5b68d..16238a6e4 100644
--- a/newlib/libm/complex/casinh.c
+++ b/newlib/libm/complex/casinh.c
@@ -32,6 +32,59 @@
  * Marco Atzeri <marco_atzeri@yahoo.it>
  */
 
+/*
+FUNCTION
+        <<casinh>>, <<casinhf>>---complex arc hyperbolic sine
+
+INDEX
+        casinh
+INDEX
+        casinhf
+
+ANSI_SYNOPSIS
+       #include <complex.h>
+       double complex casinh(double complex <[z]>);
+       float complex casinhf(float complex <[z]>);
+
+
+DESCRIPTION
+        @ifnottex
+        These functions compute the complex arc hyperbolic sine of <[z]>,
+        with branch cuts outside the interval [-i, +i] along the 
+        imaginary axis.        
+        @end ifnottex
+        @tex
+        These functions compute the complex arc hyperbolic sine of <[z]>,
+        with branch cuts outside the interval [$-i$, $+i$] along the 
+        imaginary axis.        
+        @end tex
+
+        <<casinhf>> is identical to <<casinh>>, except that it performs
+        its calculations on <<floats complex>>.
+
+RETURNS
+        @ifnottex
+        These functions return the complex arc hyperbolic sine value, 
+        in the range of a strip mathematically unbounded along the 
+        real axis and in the interval [-i*p/2, +i*p/2] along the 
+        imaginary axis.
+        @end ifnottex
+        @tex
+        These functions return the complex arc hyperbolic sine value, 
+        in the range of a strip mathematically unbounded along the 
+        real axis and in the interval [$-i\pi/2$, $+i\pi/2$] along the 
+        imaginary axis.
+        @end tex
+
+PORTABILITY
+        <<casinh>> and <<casinhf>> are ISO C99
+
+QUICKREF
+        <<casinh>> and <<casinhf>> are ISO C99
+
+*/
+
+
 #include <complex.h>
 
 double complex