diff --git a/cmd/cloud-controller-manager/app/options/options.go b/cmd/cloud-controller-manager/app/options/options.go
index 58cd3fbe9ba..bec9d12a342 100644
--- a/cmd/cloud-controller-manager/app/options/options.go
+++ b/cmd/cloud-controller-manager/app/options/options.go
@@ -45,6 +45,8 @@ type CloudControllerManagerServer struct {
 // NewCloudControllerManagerServer creates a new ExternalCMServer with a default config.
 func NewCloudControllerManagerServer() *CloudControllerManagerServer {
 	s := CloudControllerManagerServer{
+		// Part of these default values also present in 'cmd/kube-controller-manager/app/options/options.go'.
+		// Please keep them in sync when doing update.
 		KubeControllerManagerConfiguration: componentconfig.KubeControllerManagerConfiguration{
 			Port:                      ports.CloudControllerManagerPort,
 			Address:                   "0.0.0.0",
diff --git a/cmd/kube-controller-manager/app/options/options.go b/cmd/kube-controller-manager/app/options/options.go
index e5acccd066b..12f6264dfb0 100644
--- a/cmd/kube-controller-manager/app/options/options.go
+++ b/cmd/kube-controller-manager/app/options/options.go
@@ -55,6 +55,8 @@ func NewCMServer() *CMServer {
 	}
 
 	s := CMServer{
+		// Part of these default values also present in 'cmd/cloud-controller-manager/app/options/options.go'.
+		// Please keep them in sync when doing update.
 		KubeControllerManagerConfiguration: componentconfig.KubeControllerManagerConfiguration{
 			Controllers:                                     []string{"*"},
 			Port:                                            ports.ControllerManagerPort,