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diff --git a/ext/polymorphic-port.lv2/polymorphic-port.h b/ext/polymorphic-port.lv2/polymorphic-port.h
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+/* lv2_data_access.h - C header file for the LV2 Data Access extension.
+ * Copyright (C) 2008-2009 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 Polymorphic Port extension
+ * <http://lv2plug.in/ns/ext/polymorphic-port>.
+ *
+ * This extension defines a buffer format for ports that can take on
+ * various types dynamically at runtime.
+ */
+
+#ifndef LV2_POLYMORPHIC_PORT_H
+#define LV2_POLYMORPHIC_PORT_H
+
+#define LV2_POLYMORPHIC_PORT_URI "http://lv2plug.in/ns/ext/polymorphic-port"
+
+/** The data field of the LV2_Feature for this extension.
+ *
+ * To support this feature the host must pass an LV2_Feature struct to the
+ * instantiate method with URI "http://lv2plug.in/ns/ext/polymorphic-port"
+ * and data pointed to an instance of this struct.
+ */
+typedef struct {
+
+	/** Set the type of a polymorphic port.
+	 * If the plugin specifies constraints on port types, the host MUST NOT
+	 * call the run method until all port types have been set to a valid
+	 * configuration.  Whenever the type for a port is changed, the host
+	 * MUST call connect_port before the next call to the run method.
+	 * The return value of this function SHOULD be ignored by hosts at this
+	 * time (future revisions of this extension may specify return values).
+	 * Plugins which do not know of any future revision or extension that
+	 * dictates otherwise MUST return 0 from this function.
+	 * @param port Index of the port to connect (same as LV2 connect_port)
+	 * @param type Mapped URI for the type of data being connected
+	 * @param type_data Type specific data defined by type URI (may be NULL)
+	 * @return Unused at this time
+	 */
+	uint32_t (*set_type)(LV2_Handle instance,
+	                     uint32_t   port,
+	                     uint32_t   type,
+	                     void*      type_data);
+
+} LV2_Polymorphic_Feature;
+
+
+#endif /* LV2_POLYMORPHIC_PORT_H */
+