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diff --git a/include/lv2/resize-port/resize-port.h b/include/lv2/resize-port/resize-port.h
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+++ b/include/lv2/resize-port/resize-port.h
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+/*
+  Copyright 2007-2016 David Robillard <d@drobilla.net>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#ifndef LV2_RESIZE_PORT_H
+#define LV2_RESIZE_PORT_H
+
+/**
+   @defgroup resize-port Resize Port
+   @ingroup lv2
+
+   Dynamically sized LV2 port buffers.
+
+   @{
+*/
+
+#include <stddef.h>
+#include <stdint.h>
+
+// clang-format off
+
+#define LV2_RESIZE_PORT_URI    "http://lv2plug.in/ns/ext/resize-port"  ///< http://lv2plug.in/ns/ext/resize-port
+#define LV2_RESIZE_PORT_PREFIX LV2_RESIZE_PORT_URI "#"                 ///< http://lv2plug.in/ns/ext/resize-port#
+
+#define LV2_RESIZE_PORT__asLargeAs   LV2_RESIZE_PORT_PREFIX "asLargeAs"    ///< http://lv2plug.in/ns/ext/resize-port#asLargeAs
+#define LV2_RESIZE_PORT__minimumSize LV2_RESIZE_PORT_PREFIX "minimumSize"  ///< http://lv2plug.in/ns/ext/resize-port#minimumSize
+#define LV2_RESIZE_PORT__resize      LV2_RESIZE_PORT_PREFIX "resize"       ///< http://lv2plug.in/ns/ext/resize-port#resize
+
+// clang-format on
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** A status code for state functions. */
+typedef enum {
+  LV2_RESIZE_PORT_SUCCESS      = 0, /**< Completed successfully. */
+  LV2_RESIZE_PORT_ERR_UNKNOWN  = 1, /**< Unknown error. */
+  LV2_RESIZE_PORT_ERR_NO_SPACE = 2  /**< Insufficient space. */
+} LV2_Resize_Port_Status;
+
+/** Opaque data for resize method. */
+typedef void* LV2_Resize_Port_Feature_Data;
+
+/** Host feature to allow plugins to resize their port buffers. */
+typedef struct {
+  /** Opaque data for resize method. */
+  LV2_Resize_Port_Feature_Data data;
+
+  /**
+     Resize a port buffer to at least `size` bytes.
+
+     This function MAY return an error, in which case the port buffer was not
+     resized and the port is still connected to the same location.  Plugins
+     MUST gracefully handle this situation.
+
+     This function is in the audio threading class.
+
+     The host MUST preserve the contents of the port buffer when resizing.
+
+     Plugins MAY resize a port many times in a single run callback.  Hosts
+     SHOULD make this as inexpensive as possible.
+  */
+  LV2_Resize_Port_Status (*resize)(LV2_Resize_Port_Feature_Data data,
+                                   uint32_t                     index,
+                                   size_t                       size);
+} LV2_Resize_Port_Resize;
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+/**
+   @}
+*/
+
+#endif /* LV2_RESIZE_PORT_H */