diff --git a/pkg/apis/networking/types.go b/pkg/apis/networking/types.go
index 7a4d1460609..a8cb459467e 100644
--- a/pkg/apis/networking/types.go
+++ b/pkg/apis/networking/types.go
@@ -77,7 +77,7 @@ type NetworkPolicySpec struct {
 	Egress []NetworkPolicyEgressRule
 
 	// List of rule types that the NetworkPolicy relates to.
-	// Valid options are "Ingress", "Egress", or "Ingress,Egress".
+	// Valid options are ["Ingress"], ["Egress"], or ["Ingress", "Egress"].
 	// If this field is not specified, it will default based on the existence of Ingress or Egress rules;
 	// policies that contain an Egress section are assumed to affect Egress, and all policies
 	// (whether or not they contain an Ingress section) are assumed to affect Ingress.
diff --git a/staging/src/k8s.io/api/extensions/v1beta1/generated.proto b/staging/src/k8s.io/api/extensions/v1beta1/generated.proto
index f3d77550f83..5e3d165ebe6 100644
--- a/staging/src/k8s.io/api/extensions/v1beta1/generated.proto
+++ b/staging/src/k8s.io/api/extensions/v1beta1/generated.proto
@@ -792,7 +792,7 @@ message NetworkPolicySpec {
   repeated NetworkPolicyEgressRule egress = 3;
 
   // List of rule types that the NetworkPolicy relates to.
-  // Valid options are "Ingress", "Egress", or "Ingress,Egress".
+  // Valid options are ["Ingress"], ["Egress"], or ["Ingress", "Egress"].
   // If this field is not specified, it will default based on the existence of Ingress or Egress rules;
   // policies that contain an Egress section are assumed to affect Egress, and all policies
   // (whether or not they contain an Ingress section) are assumed to affect Ingress.
diff --git a/staging/src/k8s.io/api/extensions/v1beta1/types.go b/staging/src/k8s.io/api/extensions/v1beta1/types.go
index 63a316856b1..f3479713c53 100644
--- a/staging/src/k8s.io/api/extensions/v1beta1/types.go
+++ b/staging/src/k8s.io/api/extensions/v1beta1/types.go
@@ -1409,7 +1409,7 @@ type NetworkPolicySpec struct {
 	Egress []NetworkPolicyEgressRule `json:"egress,omitempty" protobuf:"bytes,3,rep,name=egress"`
 
 	// List of rule types that the NetworkPolicy relates to.
-	// Valid options are "Ingress", "Egress", or "Ingress,Egress".
+	// Valid options are ["Ingress"], ["Egress"], or ["Ingress", "Egress"].
 	// If this field is not specified, it will default based on the existence of Ingress or Egress rules;
 	// policies that contain an Egress section are assumed to affect Egress, and all policies
 	// (whether or not they contain an Ingress section) are assumed to affect Ingress.
diff --git a/staging/src/k8s.io/api/networking/v1/generated.proto b/staging/src/k8s.io/api/networking/v1/generated.proto
index abf592db0a9..02aa1fc1608 100644
--- a/staging/src/k8s.io/api/networking/v1/generated.proto
+++ b/staging/src/k8s.io/api/networking/v1/generated.proto
@@ -446,7 +446,7 @@ message NetworkPolicySpec {
   repeated NetworkPolicyEgressRule egress = 3;
 
   // List of rule types that the NetworkPolicy relates to.
-  // Valid options are "Ingress", "Egress", or "Ingress,Egress".
+  // Valid options are ["Ingress"], ["Egress"], or ["Ingress", "Egress"].
   // If this field is not specified, it will default based on the existence of Ingress or Egress rules;
   // policies that contain an Egress section are assumed to affect Egress, and all policies
   // (whether or not they contain an Ingress section) are assumed to affect Ingress.
diff --git a/staging/src/k8s.io/api/networking/v1/types.go b/staging/src/k8s.io/api/networking/v1/types.go
index 170791f52cc..12731f0c6a0 100644
--- a/staging/src/k8s.io/api/networking/v1/types.go
+++ b/staging/src/k8s.io/api/networking/v1/types.go
@@ -80,7 +80,7 @@ type NetworkPolicySpec struct {
 	Egress []NetworkPolicyEgressRule `json:"egress,omitempty" protobuf:"bytes,3,rep,name=egress"`
 
 	// List of rule types that the NetworkPolicy relates to.
-	// Valid options are "Ingress", "Egress", or "Ingress,Egress".
+	// Valid options are ["Ingress"], ["Egress"], or ["Ingress", "Egress"].
 	// If this field is not specified, it will default based on the existence of Ingress or Egress rules;
 	// policies that contain an Egress section are assumed to affect Egress, and all policies
 	// (whether or not they contain an Ingress section) are assumed to affect Ingress.