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diff --git a/ext/urid.lv2/urid.h b/ext/urid.lv2/urid.h
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+/*
+  Copyright 2011 Gabriel M. Beddingfield <gabrbedd@gmail.com>
+  Copyright 2008-2011 David Robillard <http://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.
+*/
+
+/**
+   @file
+   C header for the LV2 URID extension <http://lv2plug.in/ns/ext/urid>
+*/
+
+#ifndef LV2_URID_H
+#define LV2_URID_H
+
+#define LV2_URID_URI "http://lv2plug.in/ns/ext/urid"
+
+#include <stdint.h>
+
+/**
+   Opaque pointer to host data.
+*/
+typedef void* LV2_URID_Callback_Data;
+
+/**
+   URI mapped to an integer.
+*/
+typedef uint32_t LV2_URID;
+
+/**
+   URID Feature.
+
+   To support this feature the host must pass an LV2_Feature struct to the
+   plugin's instantiate method with URI "http://lv2plug.in/ns/ext/urid#URIMap"
+   and data pointed to an instance of this struct.
+*/
+typedef struct {
+
+	/**
+	   Opaque pointer to host data.
+
+	   The plugin MUST pass this to any call to functions in this struct.
+	   Otherwise, it must not be interpreted in any way.
+	*/
+	LV2_URID_Callback_Data callback_data;
+
+	/**
+	   Get the numeric ID of a URI from the host.
+
+	   If the ID does not already exist, it will be created.
+
+	   @param callback_data Must be the callback_data member of this struct.
+	   @param uri The URI to be mapped to an integer ID.
+
+	   This function is referentially transparent; any number of calls with the
+	   same arguments is guaranteed to return the same value over the life of a
+	   plugin instance.  However, this function is not necessarily very
+	   fast or RT-safe: plugins SHOULD cache any IDs they might need in
+	   performance critical situations.
+
+	   The return value 0 is reserved and indicates that an ID for that URI
+	   could not be created for whatever reason.  However, hosts SHOULD NOT
+	   return 0 from this function in non-exceptional circumstances (i.e. the
+	   URI map SHOULD be dynamic).
+	*/
+	LV2_URID (*map_uri)(LV2_URID_Callback_Data callback_data,
+	                    const char*            uri);
+
+	/**
+	   Get the URI for a given numeric ID from the host.
+
+	   @param callback_data Must be the callback_data member of this struct.
+	   @param id The ID to be mapped back to the URI string.
+
+	   Returns NULL if @c id is not yet mapped.  Otherwise, the corresponding
+	   URI is returned in a canonical form.  This may not be the exact same
+	   string that was originally passed to map_uri(), but it will be an
+	   identical URI according to the URI spec.  A non-NULL return for a given
+	   @c id will always be the same for the life of the plugin.  Plugins that
+	   intend to perform string comparison on unmapped URIs should first
+	   canonicalise URI strings with a call to map_uri() followed by a call to
+	   unmap_uri().
+	*/
+	const char* (*unmap_uri)(LV2_URID_Callback_Data callback_data,
+	                         LV2_URID               urid);
+
+} LV2_URID_Feature;
+
+#endif /* LV2_URID_H */