diff --git a/README.md b/README.md
index c685642..3d97799 100644
--- a/README.md
+++ b/README.md
@@ -15,12 +15,12 @@ Examples:
   # Open service/kubernetes-dashboard in namespace/kube-system
   kubectl open-svc kubernetes-dashboard -n kube-system
 
-  # Open port 15014 of service/istiod in namespace/istio-system
-  kubectl open-svc istiod -n istio-system --svc-port 15014
-
   # Open port "http-monitoring" of service/istiod in namespace/istio-system
   kubectl open-svc istiod -n istio-system --svc-port http-monitoring
 
+  # Open port 15014 of service/istiod in namespace/istio-system
+  kubectl open-svc istiod -n istio-system --svc-port 15014
+
   # Use "https" scheme with --scheme option for connections between the apiserver
   # and service/rook-ceph-mgr-dashboard in namespace/rook-ceph
   kubectl open-svc rook-ceph-mgr-dashboard -n rook-ceph --scheme https
diff --git a/pkg/cmd/open-svc.go b/pkg/cmd/open-svc.go
index 90d4b95..c6169b2 100644
--- a/pkg/cmd/open-svc.go
+++ b/pkg/cmd/open-svc.go
@@ -48,12 +48,12 @@ var (
 		# Open service/kubernetes-dashboard in namespace/kube-system
 		kubectl open-svc kubernetes-dashboard -n kube-system
 
-		# Open port 15014 of service/istiod in namespace/istio-system
-		kubectl open-svc istiod -n istio-system --svc-port 15014
-
 		# Open port "http-monitoring" of service/istiod in namespace/istio-system
 		kubectl open-svc istiod -n istio-system --svc-port http-monitoring
 
+		# Open port 15014 of service/istiod in namespace/istio-system
+		kubectl open-svc istiod -n istio-system --svc-port 15014
+
 		# Use "https" scheme with --scheme option for connections between the apiserver
 		# and service/rook-ceph-mgr-dashboard in namespace/rook-ceph
 		kubectl open-svc rook-ceph-mgr-dashboard -n rook-ceph --scheme https
@@ -238,25 +238,25 @@ func (o *OpenServiceOptions) getServiceProxyPath(svc *v1.Service) (string, error
 		return "", fmt.Errorf("Looks like service/%s is a headless service", svc.GetName())
 	}
 
-	var port v1.ServicePort
+	var port *v1.ServicePort
 
 	if o.svcPort == "" {
-		port = svc.Spec.Ports[0]
+		port = &svc.Spec.Ports[0]
 
 		if l > 1 {
-			fmt.Fprintf(o.ErrOut, "service/%s has %d ports, defaulting port %d\n", svc.GetName(), l, port.Port)
+			fmt.Fprintf(o.ErrOut, "service/%s has %d ports, defaulting port %d. You can use the another port with --svc-port flag.\n", svc.GetName(), l, port.Port)
 		}
 	} else {
 		var isMatchingPort func(p v1.ServicePort) bool
 
 		portNumber, err := strconv.ParseInt(o.svcPort, 10, 32)
 		if err == nil {
-			klog.V(4).Info("treat svc-port %q as a port number", o.svcPort)
+			klog.V(4).Infof("treat svc-port %q as a port number", o.svcPort)
 			isMatchingPort = func(p v1.ServicePort) bool {
 				return p.Port == int32(portNumber)
 			}
 		} else {
-			klog.V(4).Info("treat svc-port %q as a port name", o.svcPort)
+			klog.V(4).Infof("treat svc-port %q as a port name", o.svcPort)
 			isMatchingPort = func(p v1.ServicePort) bool {
 				return p.Name == o.svcPort
 			}
@@ -264,12 +264,12 @@ func (o *OpenServiceOptions) getServiceProxyPath(svc *v1.Service) (string, error
 
 		for _, p := range svc.Spec.Ports {
 			if isMatchingPort(p) {
-				port = p
+				port = &p
 				break
 			}
 		}
 
-		if port.Name == "" {
+		if port == nil {
 			return "", fmt.Errorf("port %q not found in service/%s", o.svcPort, svc.GetName())
 		}
 	}
diff --git a/pkg/cmd/open-svc_test.go b/pkg/cmd/open-svc_test.go
index 2640e32..6fce6c5 100644
--- a/pkg/cmd/open-svc_test.go
+++ b/pkg/cmd/open-svc_test.go
@@ -313,6 +313,28 @@ func TestOpenServiceOptionsGetServiceProxyPath(t *testing.T) {
 			"/api/v1/namespaces/default/services/nginx:metrics/proxy",
 			"",
 		},
+		{
+			"no port name with service port number",
+			&OpenServiceOptions{
+				IOStreams: genericclioptions.NewTestIOStreamsDiscard(),
+				svcPort:   "10254",
+			},
+			&v1.Service{
+				ObjectMeta: metav1.ObjectMeta{
+					Name:      "nginx",
+					Namespace: "default",
+				},
+				Spec: v1.ServiceSpec{
+					Ports: []v1.ServicePort{
+						{
+							Port: 10254,
+						},
+					},
+				},
+			},
+			"/api/v1/namespaces/default/services/nginx/proxy",
+			"",
+		},
 	}
 
 	for _, tt := range tests {