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diff --git a/ext/uri-unmap.lv2/uri-unmap.h b/ext/uri-unmap.lv2/uri-unmap.h
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+++ b/ext/uri-unmap.lv2/uri-unmap.h
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+/* lv2_uri_unmap.h - C header file for the LV2 URI Unmap extension.
+ *
+ * Copyright (C) 2010 David Robillard <http://drobilla.net>
+ *
+ * This header 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 of the License, or
+ * (at your option) any later version.
+ *
+ * This header 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.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this header; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place, Suite 330, Boston, MA 01222-1307 USA
+ */
+
+/** @file
+ * C header for the LV2 URI Map extension <http://lv2plug.in/ns/ext/uri-unmap>.
+ */
+
+#ifndef LV2_URI_UNMAP_H
+#define LV2_URI_UNMAP_H
+
+#define LV2_URI_UNMAP_URI "http://lv2plug.in/ns/ext/uri-unmap"
+
+#include <stdint.h>
+
+
+/** Opaque pointer to host data. */
+typedef void* LV2_Uri_Unmap_Callback_Data;
+
+
+/** The data field of the LV2_Feature for the URI Unmap extension.
+ *
+ * To support this extension the host must pass an LV2_Feature struct to the
+ * plugin's instantiate method with URI "http://lv2plug.in/ns/ext/uri-unmap"
+ * 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_Uri_Unmap_Callback_Data callback_data;
+
+	/** Get the numeric ID of a URI from the host.
+	 *
+	 * @param callback_data Must be the callback_data member of this struct.
+	 * @param map The 'context' used to map this URI.
+	 * @param id The URI ID to unmap.
+	 * @return The string form of @a id, or NULL on error.
+	 *
+	 * The @a id MUST be a value previously returned from
+	 * LV2_Uri_Map_Feature.uri_to_id.
+	 *
+	 * The returned string is owned by the host and MUST NOT be freed by
+	 * the plugin or stored for a long period of time (e.g. across run
+	 * invocations) without copying.
+	 *
+	 * 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 (though the same ID may return different values
+	 * with a different map parameter).
+	 */
+	const char* (*id_to_uri)(LV2_Uri_Unmap_Callback_Data callback_data,
+	                         const char*                 map,
+	                         uint32_t                    id);
+
+} LV2_Uri_Unmap_Feature;
+
+
+#endif /* LV2_URI_UNMAP_H */
+