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diff --git a/src/timeline-object.h b/src/timeline-object.h
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+/*
+ * Copyright © 2014 Pekka Paalanen <pq@iki.fi>
+ * Copyright © 2014 Collabora, Ltd.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and
+ * its documentation for any purpose is hereby granted without fee, provided
+ * that the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation, and that the name of the copyright holders not be used in
+ * advertising or publicity pertaining to distribution of the software
+ * without specific, written prior permission.  The copyright holders make
+ * no representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * SPECIAL, 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 WESTON_TIMELINE_OBJECT_H
+#define WESTON_TIMELINE_OBJECT_H
+
+/*
+ * This struct can be embedded in objects related to timeline output.
+ * It must be initialized to all-zero. Afterwards, the timeline code
+ * will handle it alone. No clean-up is necessary.
+ */
+struct weston_timeline_object {
+	/*
+	 * Timeline series gets bumped every time a new log is opened.
+	 * This triggers id allocation and object info emission.
+	 * 0 is an invalid series value.
+	 */
+	unsigned series;
+
+	/* Object id in the timeline JSON output. 0 is invalid. */
+	unsigned id;
+
+	/*
+	 * If non-zero, forces a re-emission of object description.
+	 * Should be set to non-zero, when changing long-lived
+	 * object state that is not emitted on normal timeline
+	 * events.
+	 */
+	unsigned force_refresh;
+};
+
+#endif /* WESTON_TIMELINE_OBJECT_H */