diff --git a/include/system/window.h b/include/system/window.h
index 44bfc9b..33b7c3d 100644
--- a/include/system/window.h
+++ b/include/system/window.h
@@ -278,6 +278,16 @@
      * age will be 0.
      */
     NATIVE_WINDOW_BUFFER_AGE = 13,
+
+    /*
+     * Returns the duration of the last dequeueBuffer call in microseconds
+     */
+    NATIVE_WINDOW_LAST_DEQUEUE_DURATION = 14,
+
+    /*
+     * Returns the duration of the last queueBuffer call in microseconds
+     */
+    NATIVE_WINDOW_LAST_QUEUE_DURATION = 15,
 };
 
 /* Valid operations for the (*perform)() hook.