diff --git a/include/hardware/keymaster_defs.h b/include/hardware/keymaster_defs.h
index 4f9de17..548af7d 100644
--- a/include/hardware/keymaster_defs.h
+++ b/include/hardware/keymaster_defs.h
@@ -356,10 +356,10 @@
  * In the future this list will expand greatly to accommodate asymmetric key import/export.
  */
 typedef enum {
-    KM_KEY_FORMAT_X509,   /* for public key export, required */
-    KM_KEY_FORMAT_PKCS8,  /* for asymmetric key pair import, required */
-    KM_KEY_FORMAT_PKCS12, /* for asymmetric key pair import, not required */
-    KM_KEY_FORMAT_RAW,    /* for symmetric key import, required */
+    KM_KEY_FORMAT_X509 = 0,   /* for public key export, required */
+    KM_KEY_FORMAT_PKCS8 = 1,  /* for asymmetric key pair import, required */
+    KM_KEY_FORMAT_PKCS12 = 2, /* for asymmetric key pair import, not required */
+    KM_KEY_FORMAT_RAW = 3,    /* for symmetric key import, required */
 } keymaster_key_format_t;
 
 /**
diff --git a/include/hardware/sensors.h b/include/hardware/sensors.h
index f0773d5..e917c0a 100644
--- a/include/hardware/sensors.h
+++ b/include/hardware/sensors.h
@@ -602,6 +602,22 @@
 #define SENSOR_TYPE_PICK_UP_GESTURE                            (25)
 #define SENSOR_STRING_TYPE_PICK_UP_GESTURE                     "android.sensor.pick_up_gesture"
 
+/*
+ * SENSOR_TYPE_WRIST_TILT_GESTURE
+ * trigger-mode: special
+ * wake-up sensor: yes
+ *
+ * A sensor of this type triggers an event each time a tilt of the wrist-worn
+ * device is detected.
+ *
+ * This sensor must be low power, as it is likely to be activated 24/7.
+ * The only allowed value to return is 1.0.
+ *
+ * Implement only the wake-up version of this sensor.
+ */
+#define SENSOR_TYPE_WRIST_TILT_GESTURE                         (26)
+#define SENSOR_STRING_TYPE_WRIST_TILT_GESTURE                  "android.sensor.wrist_tilt_gesture"
+
 /**
  * Values returned by the accelerometer in various locations in the universe.
  * all values are in SI units (m/s^2)