1 files changed, 33 insertions, 0 deletions
diff --git a/newlib/libm/complex/csin.c b/newlib/libm/complex/csin.c
index ac66b384a..cf6dae068 100644
--- a/newlib/libm/complex/csin.c
+++ b/newlib/libm/complex/csin.c
@@ -32,6 +32,39 @@
  * Marco Atzeri <marco_atzeri@yahoo.it>
  */
 
+/*
+FUNCTION
+        <<csin>>, <<csinf>>---complex sine
+
+INDEX
+        csin
+INDEX
+        csinf
+
+ANSI_SYNOPSIS
+       #include <complex.h>
+       double complex csin(double complex <[z]>);
+       float complex csinf(float complex <[z]>);
+
+
+DESCRIPTION
+        These functions compute the complex sine of <[z]>.
+
+        <<csinf>> is identical to <<csin>>, except that it performs
+        its calculations on <<floats complex>>.
+
+RETURNS
+        These functions return the complex sine value.
+
+PORTABILITY
+        <<csin>> and <<csinf>> are ISO C99
+
+QUICKREF
+        <<csin>> and <<csinf>> are ISO C99
+
+*/
+
+
 #include <complex.h>
 #include <math.h>
 #include "cephes_subr.h"