diff --git a/services/preview/eventgrid/mgmt/2020-04-01-preview/eventgrid/models.go b/services/preview/eventgrid/mgmt/2020-04-01-preview/eventgrid/models.go
index a67d91ba8602..eca2db04b476 100644
--- a/services/preview/eventgrid/mgmt/2020-04-01-preview/eventgrid/models.go
+++ b/services/preview/eventgrid/mgmt/2020-04-01-preview/eventgrid/models.go
@@ -897,7 +897,7 @@ type DomainProperties struct {
 	InputSchema InputSchema `json:"inputSchema,omitempty"`
 	// InputSchemaMapping - Information about the InputSchemaMapping which specified the info about mapping event payload.
 	InputSchemaMapping BasicInputSchemaMapping `json:"inputSchemaMapping,omitempty"`
-	// MetricResourceID - Metric resource id for the domain.
+	// MetricResourceID - READ-ONLY; Metric resource id for the domain.
 	MetricResourceID *string `json:"metricResourceId,omitempty"`
 	// AllowTrafficFromAllIPs - This determines if IP filtering rules ought to be evaluated or not. By default it will not evaluate and will allow traffic from all IPs.
 	AllowTrafficFromAllIPs *bool `json:"allowTrafficFromAllIPs,omitempty"`
@@ -1505,6 +1505,10 @@ func NewDomainTopicsListResultPage(getNextPage func(context.Context, DomainTopic
 type DomainUpdateParameters struct {
 	// Tags - Tags of the domains resource
 	Tags map[string]*string `json:"tags"`
+	// AllowTrafficFromAllIPs - This determines if IP filtering rules ought to be evaluated or not. By default it will not evaluate and will allow traffic from all IPs.
+	AllowTrafficFromAllIPs *bool `json:"allowTrafficFromAllIPs,omitempty"`
+	// InboundIPRules - This determines the IP filtering rules that ought be applied when events are received on this domain.
+	InboundIPRules *[]InboundIPRule `json:"inboundIpRules,omitempty"`
 }
 
 // MarshalJSON is the custom marshaler for DomainUpdateParameters.
@@ -1513,6 +1517,12 @@ func (dup DomainUpdateParameters) MarshalJSON() ([]byte, error) {
 	if dup.Tags != nil {
 		objectMap["tags"] = dup.Tags
 	}
+	if dup.AllowTrafficFromAllIPs != nil {
+		objectMap["allowTrafficFromAllIPs"] = dup.AllowTrafficFromAllIPs
+	}
+	if dup.InboundIPRules != nil {
+		objectMap["inboundIpRules"] = dup.InboundIPRules
+	}
 	return json.Marshal(objectMap)
 }
 
@@ -4356,7 +4366,7 @@ type TopicProperties struct {
 	InputSchema InputSchema `json:"inputSchema,omitempty"`
 	// InputSchemaMapping - This enables publishing using custom event schemas. An InputSchemaMapping can be specified to map various properties of a source schema to various required properties of the EventGridEvent schema.
 	InputSchemaMapping BasicInputSchemaMapping `json:"inputSchemaMapping,omitempty"`
-	// MetricResourceID - Metric resource id for the topic.
+	// MetricResourceID - READ-ONLY; Metric resource id for the topic.
 	MetricResourceID *string `json:"metricResourceId,omitempty"`
 	// AllowTrafficFromAllIPs - This determines if IP filtering rules ought to be evaluated or not. By default it will not evaluate and will allow traffic from all IPs.
 	AllowTrafficFromAllIPs *bool `json:"allowTrafficFromAllIPs,omitempty"`
@@ -4783,6 +4793,10 @@ type TopicTypesListResult struct {
 type TopicUpdateParameters struct {
 	// Tags - Tags of the resource.
 	Tags map[string]*string `json:"tags"`
+	// AllowTrafficFromAllIPs - This determines if IP filtering rules ought to be evaluated or not. By default it will not evaluate and will allow traffic from all IPs.
+	AllowTrafficFromAllIPs *bool `json:"allowTrafficFromAllIPs,omitempty"`
+	// InboundIPRules - This determines the IP filtering rules that ought be applied when events are received on this domain.
+	InboundIPRules *[]InboundIPRule `json:"inboundIpRules,omitempty"`
 }
 
 // MarshalJSON is the custom marshaler for TopicUpdateParameters.
@@ -4791,6 +4805,12 @@ func (tup TopicUpdateParameters) MarshalJSON() ([]byte, error) {
 	if tup.Tags != nil {
 		objectMap["tags"] = tup.Tags
 	}
+	if tup.AllowTrafficFromAllIPs != nil {
+		objectMap["allowTrafficFromAllIPs"] = tup.AllowTrafficFromAllIPs
+	}
+	if tup.InboundIPRules != nil {
+		objectMap["inboundIpRules"] = tup.InboundIPRules
+	}
 	return json.Marshal(objectMap)
 }
 
diff --git a/services/preview/eventgrid/mgmt/2020-04-01-preview/eventgrid/topictypes.go b/services/preview/eventgrid/mgmt/2020-04-01-preview/eventgrid/topictypes.go
index c778c872da09..ffc38bd26108 100644
--- a/services/preview/eventgrid/mgmt/2020-04-01-preview/eventgrid/topictypes.go
+++ b/services/preview/eventgrid/mgmt/2020-04-01-preview/eventgrid/topictypes.go
@@ -183,9 +183,9 @@ func (client TopicTypesClient) ListResponder(resp *http.Response) (result TopicT
 	return
 }
 
-// ListEventTypes list event types for a topic type
+// ListEventTypes list event types for a topic type.
 // Parameters:
-// topicTypeName - name of the topic type
+// topicTypeName - name of the topic type.
 func (client TopicTypesClient) ListEventTypes(ctx context.Context, topicTypeName string) (result EventTypesListResult, err error) {
 	if tracing.IsEnabled() {
 		ctx = tracing.StartSpan(ctx, fqdn+"/TopicTypesClient.ListEventTypes")