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diff --git a/src/liblzma/api/lzma/alone.h b/src/liblzma/api/lzma/alone.h
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+/**
+ * \file        lzma/alone.h
+ * \brief       Handling of the legacy LZMA_Alone format
+ *
+ * \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       Options for files in the LZMA_Alone format
+ */
+typedef struct {
+	/**
+	 * \brief       Uncompressed Size and usage of End of Payload Marker
+	 *
+	 * In contrast to .lzma Blocks, LZMA_Alone format cannot have both
+	 * uncompressed size field in the header and end of payload marker.
+	 * If you don't know the uncompressed size beforehand, set it to
+	 * LZMA_VLI_VALUE_UNKNOWN and liblzma will embed end of payload
+	 * marker.
+	 */
+	lzma_vli uncompressed_size;
+
+	/**
+	 * \brief       LZMA options
+	 *
+	 * The LZMA_Alone format supports only one filter: the LZMA filter.
+	 *
+	 * \note        There exists also an undocumented variant of the
+	 *              LZMA_Alone format, which uses the x86 filter in
+	 *              addition to LZMA. This format was never supported
+	 *              by LZMA Utils and is not supported by liblzma either.
+	 */
+	lzma_options_lzma lzma;
+
+} lzma_options_alone;
+
+
+/**
+ * \brief       Initializes LZMA_Alone encoder
+ *
+ * LZMA_Alone files have the suffix .lzma like the .lzma Stream files.
+ * LZMA_Alone format supports only one filter, the LZMA filter. There is
+ * no support for integrity checks like CRC32.
+ *
+ * Use this format if and only if you need to create files readable by
+ * legacy LZMA tools.
+ *
+ * LZMA_Alone encoder doesn't support LZMA_SYNC_FLUSH or LZMA_FULL_FLUSH.
+ *
+ * \return      - LZMA_OK
+ *              - LZMA_MEM_ERROR
+ *              - LZMA_PROG_ERROR
+ */
+extern lzma_ret lzma_alone_encoder(
+		lzma_stream *strm, const lzma_options_alone *options);
+
+
+/**
+ * \brief       Initializes decoder for LZMA_Alone file
+ *
+ * The LZMA_Alone decoder supports LZMA_SYNC_FLUSH.
+ *
+ * \return      - LZMA_OK
+ *              - LZMA_MEM_ERROR
+ */
+extern lzma_ret lzma_alone_decoder(lzma_stream *strm);