diff --git a/pkg/dns/dns.go b/pkg/dns/dns.go
index 9286a97783e..89c785cc8d6 100644
--- a/pkg/dns/dns.go
+++ b/pkg/dns/dns.go
@@ -225,6 +225,8 @@ func (kd *KubeDNS) setEndpointsStore() {
 				// TODO: Avoid unwanted updates.
 				kd.handleEndpointAdd(newObj)
 			},
+			// No DeleteFunc for EndpointsStore because endpoint object will be deleted
+			// when corresponding service is deleted.
 		},
 	)
 }