diff --git a/sentinel/main.go b/sentinel/main.go
index edc563b4d..87dd04531 100644
--- a/sentinel/main.go
+++ b/sentinel/main.go
@@ -1015,3 +1015,4 @@ func (h *udpHeuristic) sweepOnce(now time.Time) {
 		}
 	}
 }
+// spec 023 validation scenario 2