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diff --git a/src/server/events/Mark.hpp b/src/server/events/Mark.hpp
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+++ b/src/server/events/Mark.hpp
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+/*
+  This file is part of Ingen.
+  Copyright 2007-2016 David Robillard <http://drobilla.net/>
+
+  Ingen is free software: you can redistribute it and/or modify it under the
+  terms of the GNU Affero General Public License as published by the Free
+  Software Foundation, either version 3 of the License, or any later version.
+
+  Ingen 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 Affero General Public License for details.
+
+  You should have received a copy of the GNU Affero General Public License
+  along with Ingen.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef INGEN_EVENTS_MARK_HPP
+#define INGEN_EVENTS_MARK_HPP
+
+#include "Event.hpp"
+
+#include <map>
+
+namespace ingen {
+namespace server {
+
+class CompiledGraph;
+class Engine;
+class GraphImpl;
+
+namespace events {
+
+/** Delineate the start or end of a bundle of events.
+ *
+ * This is used to mark the ends of an undo transaction, so a single undo can
+ * undo the effects of many events (such as a paste or a graph load).
+ *
+ * \ingroup engine
+ */
+class Mark : public Event
+{
+public:
+	Mark(Engine&                   engine,
+	     SPtr<Interface>           client,
+	     SampleCount               timestamp,
+	     const ingen::BundleBegin& msg);
+
+	Mark(Engine&                 engine,
+	     SPtr<Interface>         client,
+	     SampleCount             timestamp,
+	     const ingen::BundleEnd& msg);
+
+	bool pre_process(PreProcessContext& ctx) override;
+	void execute(RunContext& context) override;
+	void post_process() override;
+
+	Execution get_execution() const override;
+
+private:
+	enum class Type { BUNDLE_BEGIN, BUNDLE_END };
+
+	typedef std::map<GraphImpl*, MPtr<CompiledGraph>> CompiledGraphs;
+
+	CompiledGraphs _compiled_graphs;
+	Type           _type;
+	int            _depth;
+};
+
+} // namespace events
+} // namespace server
+} // namespace ingen
+
+#endif // INGEN_EVENTS_MARK_HPP