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diff --git a/src/c/elementaryFunctions/asinh/zasinhs.c b/src/c/elementaryFunctions/asinh/zasinhs.c
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+/*
+ *  Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
+ *  Copyright (C) 2007-2008 - 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  asinh(z) = -i asin(i z)
+*/
+
+#include "asinh.h"
+#include "asin.h"
+
+doubleComplex		zasinhs(doubleComplex z) {
+  doubleComplex i_z = DoubleComplex(-zimags(z), zreals(z));
+  doubleComplex asin_i_z = zasins(i_z);
+
+  return DoubleComplex(zimags(asin_i_z), -zreals(asin_i_z));
+}