diff --git a/include/linux/videodev2.h b/include/linux/videodev2.h
index baafe2f..2c4e837 100644
--- a/include/linux/videodev2.h
+++ b/include/linux/videodev2.h
@@ -1832,7 +1832,8 @@
 	__u32				reserved[8];
 };
 
-#define V4L2_EVENT_SUB_FL_SEND_INITIAL (1 << 0)
+#define V4L2_EVENT_SUB_FL_SEND_INITIAL		(1 << 0)
+#define V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK	(1 << 1)
 
 struct v4l2_event_subscription {
 	__u32				type;