1 files changed, 33 insertions, 0 deletions
diff --git a/newlib/libm/complex/ctan.c b/newlib/libm/complex/ctan.c
index 33b39b497..8a566b66b 100644
--- a/newlib/libm/complex/ctan.c
+++ b/newlib/libm/complex/ctan.c
@@ -32,6 +32,39 @@
  * Marco Atzeri <marco_atzeri@yahoo.it>
  */
 
+/*
+FUNCTION
+        <<ctan>>, <<ctanf>>---complex tangent
+
+INDEX
+        ctan
+INDEX
+        ctanf
+
+ANSI_SYNOPSIS
+       #include <complex.h>
+       double complex ctan(double complex <[z]>);
+       float complex ctanf(float complex <[z]>);
+
+
+DESCRIPTION
+        These functions compute the complex tangent of <[z]>.
+
+        <<ctanf>> is identical to <<ctan>>, except that it performs
+        its calculations on <<floats complex>>.
+
+RETURNS
+        These functions return the complex tangent value.
+
+PORTABILITY
+        <<ctan>> and <<ctanf>> are ISO C99
+
+QUICKREF
+        <<ctan>> and <<ctanf>> are ISO C99
+
+*/
+
+
 #include <complex.h>
 #include <math.h>
 #include "cephes_subr.h"