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diff --git a/2.3-1/src/c/elementaryFunctions/atanh/zatanhs.c b/2.3-1/src/c/elementaryFunctions/atanh/zatanhs.c
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+/*
+ *  Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
+ *  Copyright (C) 2006-2008 - INRIA - Bruno JOFRET
+ *
+ *  This file must be used under the terms of the CeCILL.
+ *  This source file is licensed as described in the file COPYING, which
+ *  you should have received as part of this distribution.  The terms
+ *  are also available at
+ *  http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt
+ *
+ */
+
+/*
+//  METHOD
+//     based on the formula  atanh(z) = i atan(-i z)
+*/
+
+#include "atanh.h"
+#include "atan.h"
+
+doubleComplex		zatanhs(doubleComplex z) {
+  doubleComplex minus_i_z = DoubleComplex(zimags(z), -zreals(z));
+  doubleComplex atan_minus_i_z = zatans(minus_i_z);
+  return DoubleComplex(-zimags(atan_minus_i_z), zreals(atan_minus_i_z));
+}