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diff --git a/lzma/api/lzma/delta.h b/lzma/api/lzma/delta.h
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+/**
+ * \file        lzma/delta.h
+ * \brief       Delta filter
+ */
+
+/*
+ * Author: Lasse Collin
+ *
+ * This file has been put into the public domain.
+ * You can do whatever you want with this file.
+ *
+ * See ../lzma.h for information about liblzma as a whole.
+ */
+
+#ifndef LZMA_H_INTERNAL
+#	error Never include this file directly. Use <lzma.h> instead.
+#endif
+
+
+/**
+ * \brief       Filter ID
+ *
+ * Filter ID of the Delta filter. This is used as lzma_filter.id.
+ */
+#define LZMA_FILTER_DELTA       LZMA_VLI_C(0x03)
+
+
+/**
+ * \brief       Type of the delta calculation
+ *
+ * Currently only byte-wise delta is supported. Other possible types could
+ * be, for example, delta of 16/32/64-bit little/big endian integers, but
+ * these are not currently planned since byte-wise delta is almost as good.
+ */
+typedef enum {
+	LZMA_DELTA_TYPE_BYTE
+} lzma_delta_type;
+
+
+/**
+ * \brief       Options for the Delta filter
+ *
+ * These options are needed by both encoder and decoder.
+ */
+typedef struct {
+	/** For now, this must always be LZMA_DELTA_TYPE_BYTE. */
+	lzma_delta_type type;
+
+	/**
+	 * \brief       Delta distance
+	 *
+	 * With the only currently supported type, LZMA_DELTA_TYPE_BYTE,
+	 * the distance is as bytes.
+	 *
+	 * Examples:
+	 *  - 16-bit stereo audio: distance = 4 bytes
+	 *  - 24-bit RGB image data: distance = 3 bytes
+	 */
+	uint32_t dist;
+#	define LZMA_DELTA_DIST_MIN 1
+#	define LZMA_DELTA_DIST_MAX 256
+
+	/*
+	 * Reserved space to allow possible future extensions without
+	 * breaking the ABI. You should not touch these, because the names
+	 * of these variables may change. These are and will never be used
+	 * when type is LZMA_DELTA_TYPE_BYTE, so it is safe to leave these
+	 * uninitialized.
+	 */
+	uint32_t reserved_int1;
+	uint32_t reserved_int2;
+	uint32_t reserved_int3;
+	uint32_t reserved_int4;
+	void *reserved_ptr1;
+	void *reserved_ptr2;
+
+} lzma_options_delta;