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diff --git a/src/liblzma/api/lzma/alignment.h b/src/liblzma/api/lzma/alignment.h
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+++ b/src/liblzma/api/lzma/alignment.h
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+/**
+ * \file        lzma/alignment.h
+ * \brief       Calculating input and output alignment of filter chains
+ *
+ * \author      Copyright (C) 1999-2006 Igor Pavlov
+ * \author      Copyright (C) 2007 Lasse Collin
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ */
+
+#ifndef LZMA_H_INTERNAL
+#	error Never include this file directly. Use <lzma.h> instead.
+#endif
+
+
+/**
+ * \brief       Calculates the preferred alignment of the input data
+ *
+ * FIXME desc
+ */
+extern uint32_t lzma_alignment_input(
+		const lzma_options_filter *filters, uint32_t guess);
+
+
+/**
+ * \brief       Calculates the alignment of the encoded output
+ *
+ * Knowing the alignment of the output data is useful e.g. in the Block
+ * encoder which tries to align the Compressed Data field optimally.
+ *
+ * \param       filters   Pointer to lzma_options_filter array, whose last
+ *                        member must have .id = LZMA_VLI_VALUE_UNKNOWN.
+ * \param       guess     The value to return if the alignment of the output
+ *                        is the same as the alignment of the input data.
+ *                        If you want to always detect this special case,
+ *                        this guess to zero; this function never returns
+ *                        zero unless guess is zero.
+ *
+ * \return      In most cases, a small positive integer is returned;
+ *              for optimal use, the encoded output of this filter
+ *              chain should start at on offset that is a multiple of
+ *              the returned integer value.
+ *
+ *              If the alignment of the output is the same as the input
+ *              data (which this function cannot know), \a guess is
+ *              returned.
+ *
+ *              If an error occurs (that is, unknown Filter IDs or filter
+ *              options), UINT32_MAX is returned.
+ */
+extern uint32_t lzma_alignment_output(
+		const lzma_options_filter *filters, uint32_t guess);