diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h
index 176a939d15474cf73baff4b1d0020c2e1212d19b..1aff18346c7184e13ef2d8d5e7e15afee8dfb60b 100644
--- a/include/linux/ftrace_event.h
+++ b/include/linux/ftrace_event.h
@@ -207,6 +207,9 @@ struct ftrace_event_call {
 	 *   bit 1:		enabled
 	 *   bit 2:		filter_active
 	 *   bit 3:		enabled cmd record
+	 *   bit 4:		allow trace by non root (cap any)
+	 *   bit 5:		failed to apply filter
+	 *   bit 6:		ftrace internal event (do not enable)
 	 *
 	 * Changes to flags must hold the event_mutex.
 	 *