Merge "Clarify optionality of head tracker velocity"
diff --git a/sensors/aidl/android/hardware/sensors/Event.aidl b/sensors/aidl/android/hardware/sensors/Event.aidl
index e8550f1..b95299c 100644
--- a/sensors/aidl/android/hardware/sensors/Event.aidl
+++ b/sensors/aidl/android/hardware/sensors/Event.aidl
@@ -204,6 +204,8 @@
* velocity of the head (relative to itself), in radians per second.
* The direction of this vector indicates the axis of rotation, and
* the magnitude indicates the rate of rotation.
+ * If this head tracker sensor instance does not support detecting
+ * velocity, then these fields must be set to 0.
*/
float vx;
float vy;