diff --git a/dbus-top/dbus_capture.hpp b/dbus-top/dbus_capture.hpp
new file mode 100644
index 0000000..825a519
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+++ b/dbus-top/dbus_capture.hpp
@@ -0,0 +1,20 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#pragma once
+
+#include <systemd/sd-bus.h>
+
+int AcquireBus(sd_bus** ret);
+void DbusCaptureThread();