diff --git a/power/aidl/aidl_api/android.hardware.power/current/android/hardware/power/SessionHint.aidl b/power/aidl/aidl_api/android.hardware.power/current/android/hardware/power/SessionHint.aidl
index b19c77b..9c1f381 100644
--- a/power/aidl/aidl_api/android.hardware.power/current/android/hardware/power/SessionHint.aidl
+++ b/power/aidl/aidl_api/android.hardware.power/current/android/hardware/power/SessionHint.aidl
@@ -38,4 +38,5 @@
   CPU_LOAD_DOWN = 1,
   CPU_LOAD_RESET = 2,
   CPU_LOAD_RESUME = 3,
+  POWER_EFFICIENCY = 4,
 }
diff --git a/power/aidl/android/hardware/power/SessionHint.aidl b/power/aidl/android/hardware/power/SessionHint.aidl
index 6a95035..a172e12 100644
--- a/power/aidl/android/hardware/power/SessionHint.aidl
+++ b/power/aidl/android/hardware/power/SessionHint.aidl
@@ -25,22 +25,31 @@
      * This hint must be sent before reporting the actual duration to the session.
      */
     CPU_LOAD_UP = 0,
+
     /**
      * This hint indicates a decrease in CPU workload intensity. It means that
      * this hint session can reduce CPU resources and still meet the target duration.
      */
     CPU_LOAD_DOWN = 1,
-    /*
+
+    /**
      * This hint indicates an upcoming CPU workload that is completely changed and
      * unknown. It means that the hint session should reset CPU resources to a known
      * baseline to prepare for an arbitrary load, and must wake up if inactive.
      */
     CPU_LOAD_RESET = 2,
-    /*
+
+    /**
      * This hint indicates that the most recent CPU workload is resuming after a
      * period of inactivity. It means that the hint session should allocate similar
      * CPU resources to what was used previously, and must wake up if inactive.
      */
     CPU_LOAD_RESUME = 3,
 
+    /**
+     * This hint indicates that this power hint session should be applied with a
+     * power-efficient-first scheduling strategy. This means the work of this
+     * power hint session is noncritical despite its CPU intensity.
+     */
+    POWER_EFFICIENCY = 4,
 }