diff --git a/pkg/apis/core/helper/qos/qos.go b/pkg/apis/core/helper/qos/qos.go
index 5f9c2604f07..8401cb6c300 100644
--- a/pkg/apis/core/helper/qos/qos.go
+++ b/pkg/apis/core/helper/qos/qos.go
@@ -40,6 +40,7 @@ func GetPodQOS(pod *core.Pod) core.PodQOSClass {
 	limits := core.ResourceList{}
 	zeroQuantity := resource.MustParse("0")
 	isGuaranteed := true
+	// note, ephemeral containers are not considered for QoS as they cannot define resources
 	allContainers := []core.Container{}
 	allContainers = append(allContainers, pod.Spec.Containers...)
 	allContainers = append(allContainers, pod.Spec.InitContainers...)
diff --git a/staging/src/k8s.io/kubectl/pkg/util/qos/qos.go b/staging/src/k8s.io/kubectl/pkg/util/qos/qos.go
index 2715e637525..2270691f51f 100644
--- a/staging/src/k8s.io/kubectl/pkg/util/qos/qos.go
+++ b/staging/src/k8s.io/kubectl/pkg/util/qos/qos.go
@@ -37,6 +37,7 @@ func GetPodQOS(pod *core.Pod) core.PodQOSClass {
 	limits := core.ResourceList{}
 	zeroQuantity := resource.MustParse("0")
 	isGuaranteed := true
+	// note, ephemeral containers are not considered for QoS as they cannot define resources
 	allContainers := []core.Container{}
 	allContainers = append(allContainers, pod.Spec.Containers...)
 	allContainers = append(allContainers, pod.Spec.InitContainers...)