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diff --git a/tilt/clockwork_sensor.h b/tilt/clockwork_sensor.h
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+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * 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.
+ */
+
+#ifndef ANDROID_CLOCKWORK_SENSOR_INTERFACE_H
+#define ANDROID_CLOCKWORK_SENSOR_INTERFACE_H
+
+#include <hardware/sensors.h>
+
+__BEGIN_DECLS
+
+/*
+ * SENSOR_TYPE_WRIST_TILT
+ * trigger-mode: special
+ * wake-up sensor: yes
+ *
+ * A sensor of this type triggers an event each time a tilt of the device
+ * is detected.
+ *
+ * Upon detecting a tilt event, a single event is returned containing the
+ * value of the 3 accelerometer axes when the tilt event was detected.
+ *
+ *  All values are in SI units (m/s^2) and measure the acceleration of the
+ *  device minus the force of gravity.
+ *
+ *  x: Acceleration on the x-axis
+ *  y: Acceleration on the y-axis
+ *  z: Acceleration on the z-axis
+ *
+ * Note that the readings from the accelerometer include the acceleration
+ * due to gravity (which is opposite to the direction of the gravity vector).
+ *
+ * See "SENSOR_TYPE_ACCELEROMETER" for more detail on returned accelerometer
+ * data.
+ *
+ * setDelay() has no impact on this sensor type
+ *
+ *  IMPORTANT NOTE: this sensor type is very different from other types
+ *  in that it must work when the screen is off without the need of
+ *  holding a partial wake-lock and MUST allow the SoC to go into suspend.
+ *  When a tilt event is detected, the sensor must awaken the SoC and
+ *  the event be reported.
+ *
+ *  When the sensor is not activated, it must also be deactivated in the
+ *  hardware: it must not wake up the SoC anymore, even in case of
+ *  a tilt event.
+ */
+#define SENSOR_TYPE_WRIST_TILT        (SENSOR_TYPE_DEVICE_PRIVATE_BASE)
+#define SENSOR_STRING_TYPE_WRIST_TILT "com.google.android_wear.wrist.tilt"
+
+__END_DECLS
+
+#endif  /* ANDROID_CLOCKWORK_SENSOR_INTERFACE_H */