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diff --git a/stream/upb_decoder.h b/stream/upb_decoder.h
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+/*
+ * upb - a minimalist implementation of protocol buffers.
+ *
+ * upb_decoder implements a high performance, streaming decoder for protobuf
+ * data that works by implementing upb_src and getting its data from a
+ * upb_bytesrc.
+ *
+ * The decoder does not currently support non-blocking I/O, in the sense that
+ * if the bytesrc returns UPB_STATUS_TRYAGAIN it is not possible to resume the
+ * decoder when data becomes available again.  Support for this could be added,
+ * but it would add complexity and perhaps cost efficiency also.
+ *
+ * Copyright (c) 2009-2010 Joshua Haberman.  See LICENSE for details.
+ */
+
+#ifndef UPB_DECODER_H_
+#define UPB_DECODER_H_
+
+#include <stdbool.h>
+#include <stdint.h>
+#include "upb_def.h"
+#include "upb_stream.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* upb_decoder *****************************************************************/
+
+// A upb_decoder decodes the binary protocol buffer format, writing the data it
+// decodes to a upb_sink.
+struct upb_decoder;
+typedef struct upb_decoder upb_decoder;
+
+// Allocates and frees a upb_decoder, respectively.
+upb_decoder *upb_decoder_new(upb_msgdef *md);
+void upb_decoder_free(upb_decoder *d);
+
+// Resets the internal state of an already-allocated decoder.  This puts it in a
+// state where it has not seen any data, and expects the next data to be from
+// the beginning of a new protobuf.  Parsers must be reset before they can be
+// used.  A decoder can be reset multiple times.
+void upb_decoder_reset(upb_decoder *d, upb_bytesrc *bytesrc);
+
+// Returns a upb_src pointer by which the decoder can be used.  The returned
+// upb_src is invalidated by upb_decoder_reset() or upb_decoder_free().
+upb_src *upb_decoder_getsrc(upb_decoder *d);
+
+#ifdef __cplusplus
+}  /* extern "C" */
+#endif
+
+#endif  /* UPB_DECODER_H_ */