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diff --git a/include/lv2/data-access/data-access.h b/include/lv2/data-access/data-access.h
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+++ b/include/lv2/data-access/data-access.h
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+/*
+  Copyright 2008-2016 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_DATA_ACCESS_H
+#define LV2_DATA_ACCESS_H
+
+/**
+   @defgroup data-access Data Access
+   @ingroup lv2
+
+   Access to plugin extension_data() for UIs.
+
+   See <http://lv2plug.in/ns/ext/data-access> for details.
+
+   @{
+*/
+
+// clang-format off
+
+#define LV2_DATA_ACCESS_URI    "http://lv2plug.in/ns/ext/data-access"  ///< http://lv2plug.in/ns/ext/data-access
+#define LV2_DATA_ACCESS_PREFIX LV2_DATA_ACCESS_URI "#"                 ///< http://lv2plug.in/ns/ext/data-access#
+
+// clang-format on
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+   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/data-access"
+   and data pointed to an instance of this struct.
+*/
+typedef struct {
+  /**
+     A pointer to a method the UI can call to get data (of a type specified
+     by some other extension) from the plugin.
+
+     This call never is never guaranteed to return anything, UIs should
+     degrade gracefully if direct access to the plugin data is not possible
+     (in which case this function will return NULL).
+
+     This is for access to large data that can only possibly work if the UI
+     and plugin are running in the same process.  For all other things, use
+     the normal LV2 UI communication system.
+  */
+  const void* (*data_access)(const char* uri);
+} LV2_Extension_Data_Feature;
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+/**
+   @}
+*/
+
+#endif /* LV2_DATA_ACCESS_H */