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diff --git a/include/ext4_crc32.h b/include/ext4_crc32.h
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+/*
+ * Copyright (c) 2014 Grzegorz Kostka (kostka.grzegorz@gmail.com)
+ * All rights reserved.
+ *
+ * Based on FreeBSD.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - 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.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ */
+
+/** @addtogroup lwext4
+ * @{
+ */
+/**
+ * @file  ext4_crc32.h
+ * @brief Crc32c routine. Taken from FreeBSD kernel.
+ */
+
+#ifndef LWEXT4_EXT4_CRC32C_H_
+#define LWEXT4_EXT4_CRC32C_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "ext4_config.h"
+
+#include <stdint.h>
+
+/**@brief	CRC32 algorithm.
+ * @param	crc input feed
+ * @param 	buf input buffer
+ * @param	size input buffer length (bytes)
+ * @return	updated crc32 value*/
+uint32_t ext4_crc32(uint32_t crc, const void *buf, uint32_t size);
+
+/**@brief	CRC32C algorithm.
+ * @param	crc input feed
+ * @param 	buf input buffer
+ * @param	length input buffer length (bytes)
+ * @return	updated crc32c value*/
+uint32_t ext4_crc32c(uint32_t crc, const void *buf, uint32_t size);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWEXT4_EXT4_CRC32C_H_ */
+
+/**
+ * @}
+ */