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diff --git a/src/mtx_spherical_harmonics/sharmonics_normalization.h b/src/mtx_spherical_harmonics/sharmonics_normalization.h
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+++ b/src/mtx_spherical_harmonics/sharmonics_normalization.h
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+/*
+ * Recursive computation of (arbitrary degree) normalization constants
+ * for spherical harmonics, according to Gumerov and Duraiswami,
+ * "The Fast Multipole Methods for the Helmholtz Equation in Three Dimensions",
+ * Elsevier, 2005.
+ *
+ * Implementation by Franz Zotter, Institute of Electronic Music and Acoustics
+ * (IEM), University of Music and Dramatic Arts (KUG), Graz, Austria
+ * http://iem.at/Members/zotter, 2008.
+ *
+ * This code is published under the Gnu General Public License, see
+ * "LICENSE.txt"
+ */
+
+
+#ifndef _sharmonics_normalization_h__
+#define _sharmonics_normalization_h__
+#include <math.h>
+#include <stdlib.h>
+
+typedef struct _SHNorml_
+{
+   double *n;
+   size_t nmax;
+} SHNorml;
+
+SHNorml *sharmonics_normalization_new (const size_t nmax);
+
+void sharmonics_normalization_free (SHNorml *wn);
+
+#endif