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diff --git a/src/lib/openjp2/invert.h b/src/lib/openjp2/invert.h
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+/*
+ * Copyright (c) 2008, Jerome Fimes, Communications & Systemes <jerome.fimes@c-s.fr>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __INVERT_H
+#define __INVERT_H
+/**
+@file invert.h
+@brief Implementation of the matrix inversion
+
+The function in INVERT.H compute a matrix inversion with a LUP method
+*/
+
+/** @defgroup INVERT INVERT - Implementation of a matrix inversion */
+/*@{*/
+/** @name Exported functions */
+/*@{*/
+/* ----------------------------------------------------------------------- */
+
+/**
+ * Calculates a n x n double matrix inversion with a LUP method. Data is aligned, rows after rows (or columns after columns).
+ * The function does not take ownership of any memory block, data must be fred by the user.
+ *
+ * @param pSrcMatrix	the matrix to invert.
+ * @param pDestMatrix	data to store the inverted matrix. 
+ * @return OPJ_TRUE if the inversion is successful, OPJ_FALSE if the matrix is singular.
+ */
+opj_bool opj_matrix_inversion_f(OPJ_FLOAT32 * pSrcMatrix,
+                                OPJ_FLOAT32 * pDestMatrix, 
+                                OPJ_UINT32 n);
+/* ----------------------------------------------------------------------- */
+/*@}*/
+
+/*@}*/
+
+#endif /* __INVERT_H */ 
+\ No newline at end of file