diff --git a/networking/v1/destination_rule_alias.gen.go b/networking/v1/destination_rule_alias.gen.go
index 76c48e73fd..a0403feedb 100644
--- a/networking/v1/destination_rule_alias.gen.go
+++ b/networking/v1/destination_rule_alias.gen.go
@@ -35,6 +35,10 @@ type DestinationRule = v1alpha3.DestinationRule
 type TrafficPolicy = v1alpha3.TrafficPolicy
 
 // Traffic policies that apply to specific ports of the service
+// Note that port-level settings override the destination-level settings.
+// Traffic settings specified at the destination-level will not be inherited
+// when overridden by port-level settings, i.e. default values will be
+// applied to fields omitted in port-level traffic policies.
 type TrafficPolicy_PortTrafficPolicy = v1alpha3.TrafficPolicy_PortTrafficPolicy
 type TrafficPolicy_TunnelSettings = v1alpha3.TrafficPolicy_TunnelSettings
 type TrafficPolicy_ProxyProtocol = v1alpha3.TrafficPolicy_ProxyProtocol
diff --git a/networking/v1alpha3/destination_rule.pb.go b/networking/v1alpha3/destination_rule.pb.go
index c2a1474e78..b44fea8746 100644
--- a/networking/v1alpha3/destination_rule.pb.go
+++ b/networking/v1alpha3/destination_rule.pb.go
@@ -1692,6 +1692,10 @@ func (x *LocalityLoadBalancerSetting) GetEnabled() *wrappers.BoolValue {
 }
 
 // Traffic policies that apply to specific ports of the service
+// Note that port-level settings override the destination-level settings.
+// Traffic settings specified at the destination-level will not be inherited
+// when overridden by port-level settings, i.e. default values will be
+// applied to fields omitted in port-level traffic policies.
 type TrafficPolicy_PortTrafficPolicy struct {
 	state protoimpl.MessageState `protogen:"open.v1"`
 	// Specifies the number of a port on the destination service
diff --git a/networking/v1alpha3/destination_rule.pb.html b/networking/v1alpha3/destination_rule.pb.html
index d465b81f6a..bb5bf151dc 100644
--- a/networking/v1alpha3/destination_rule.pb.html
+++ b/networking/v1alpha3/destination_rule.pb.html
@@ -283,7 +283,11 @@ <h2 id="TrafficPolicy">TrafficPolicy</h2>
 </section>
 <h3 id="TrafficPolicy-PortTrafficPolicy">PortTrafficPolicy</h3>
 <section>
-<p>Traffic policies that apply to specific ports of the service</p>
+<p>Traffic policies that apply to specific ports of the service
+Note that port-level settings override the destination-level settings.
+Traffic settings specified at the destination-level will not be inherited
+when overridden by port-level settings, i.e. default values will be
+applied to fields omitted in port-level traffic policies.</p>
 
 <table class="message-fields">
 <thead>
diff --git a/networking/v1alpha3/destination_rule.proto b/networking/v1alpha3/destination_rule.proto
index d2589a87aa..305838fde7 100644
--- a/networking/v1alpha3/destination_rule.proto
+++ b/networking/v1alpha3/destination_rule.proto
@@ -219,6 +219,10 @@ message TrafficPolicy {
   ClientTLSSettings tls = 4;
 
   // Traffic policies that apply to specific ports of the service
+  // Note that port-level settings override the destination-level settings.
+  // Traffic settings specified at the destination-level will not be inherited
+  // when overridden by port-level settings, i.e. default values will be
+  // applied to fields omitted in port-level traffic policies.
   message PortTrafficPolicy {
     // Specifies the number of a port on the destination service
     // on which this policy is being applied.
diff --git a/networking/v1beta1/destination_rule_alias.gen.go b/networking/v1beta1/destination_rule_alias.gen.go
index e4ba6cb84e..5a6ddb1429 100644
--- a/networking/v1beta1/destination_rule_alias.gen.go
+++ b/networking/v1beta1/destination_rule_alias.gen.go
@@ -35,6 +35,10 @@ type DestinationRule = v1alpha3.DestinationRule
 type TrafficPolicy = v1alpha3.TrafficPolicy
 
 // Traffic policies that apply to specific ports of the service
+// Note that port-level settings override the destination-level settings.
+// Traffic settings specified at the destination-level will not be inherited
+// when overridden by port-level settings, i.e. default values will be
+// applied to fields omitted in port-level traffic policies.
 type TrafficPolicy_PortTrafficPolicy = v1alpha3.TrafficPolicy_PortTrafficPolicy
 type TrafficPolicy_TunnelSettings = v1alpha3.TrafficPolicy_TunnelSettings
 type TrafficPolicy_ProxyProtocol = v1alpha3.TrafficPolicy_ProxyProtocol