diff --git a/services/preview/eventgrid/mgmt/2017-09-15-preview/eventgrid/client.go b/services/preview/eventgrid/mgmt/2017-09-15-preview/eventgrid/client.go
index 48762abb3fc9..d550806be6d6 100644
--- a/services/preview/eventgrid/mgmt/2017-09-15-preview/eventgrid/client.go
+++ b/services/preview/eventgrid/mgmt/2017-09-15-preview/eventgrid/client.go
@@ -41,7 +41,8 @@ func New(subscriptionID string) BaseClient {
 	return NewWithBaseURI(DefaultBaseURI, subscriptionID)
 }
 
-// NewWithBaseURI creates an instance of the BaseClient client.
+// NewWithBaseURI creates an instance of the BaseClient client using a custom endpoint.  Use this when interacting with
+// an Azure cloud that uses a non-standard base URI (sovereign clouds, Azure stack).
 func NewWithBaseURI(baseURI string, subscriptionID string) BaseClient {
 	return BaseClient{
 		Client:         autorest.NewClientWithUserAgent(UserAgent()),
diff --git a/services/preview/eventgrid/mgmt/2017-09-15-preview/eventgrid/eventsubscriptions.go b/services/preview/eventgrid/mgmt/2017-09-15-preview/eventgrid/eventsubscriptions.go
index fd6e64ed3df0..42428e089751 100644
--- a/services/preview/eventgrid/mgmt/2017-09-15-preview/eventgrid/eventsubscriptions.go
+++ b/services/preview/eventgrid/mgmt/2017-09-15-preview/eventgrid/eventsubscriptions.go
@@ -35,7 +35,9 @@ func NewEventSubscriptionsClient(subscriptionID string) EventSubscriptionsClient
 	return NewEventSubscriptionsClientWithBaseURI(DefaultBaseURI, subscriptionID)
 }
 
-// NewEventSubscriptionsClientWithBaseURI creates an instance of the EventSubscriptionsClient client.
+// NewEventSubscriptionsClientWithBaseURI creates an instance of the EventSubscriptionsClient client using a custom
+// endpoint.  Use this when interacting with an Azure cloud that uses a non-standard base URI (sovereign clouds, Azure
+// stack).
 func NewEventSubscriptionsClientWithBaseURI(baseURI string, subscriptionID string) EventSubscriptionsClient {
 	return EventSubscriptionsClient{NewWithBaseURI(baseURI, subscriptionID)}
 }
diff --git a/services/preview/eventgrid/mgmt/2017-09-15-preview/eventgrid/operations.go b/services/preview/eventgrid/mgmt/2017-09-15-preview/eventgrid/operations.go
index c01d81f86251..c1a3673a7dcc 100644
--- a/services/preview/eventgrid/mgmt/2017-09-15-preview/eventgrid/operations.go
+++ b/services/preview/eventgrid/mgmt/2017-09-15-preview/eventgrid/operations.go
@@ -35,7 +35,8 @@ func NewOperationsClient(subscriptionID string) OperationsClient {
 	return NewOperationsClientWithBaseURI(DefaultBaseURI, subscriptionID)
 }
 
-// NewOperationsClientWithBaseURI creates an instance of the OperationsClient client.
+// NewOperationsClientWithBaseURI creates an instance of the OperationsClient client using a custom endpoint.  Use this
+// when interacting with an Azure cloud that uses a non-standard base URI (sovereign clouds, Azure stack).
 func NewOperationsClientWithBaseURI(baseURI string, subscriptionID string) OperationsClient {
 	return OperationsClient{NewWithBaseURI(baseURI, subscriptionID)}
 }
diff --git a/services/preview/eventgrid/mgmt/2017-09-15-preview/eventgrid/topics.go b/services/preview/eventgrid/mgmt/2017-09-15-preview/eventgrid/topics.go
index d30859b38a38..363a4bfd2c3c 100644
--- a/services/preview/eventgrid/mgmt/2017-09-15-preview/eventgrid/topics.go
+++ b/services/preview/eventgrid/mgmt/2017-09-15-preview/eventgrid/topics.go
@@ -36,7 +36,8 @@ func NewTopicsClient(subscriptionID string) TopicsClient {
 	return NewTopicsClientWithBaseURI(DefaultBaseURI, subscriptionID)
 }
 
-// NewTopicsClientWithBaseURI creates an instance of the TopicsClient client.
+// NewTopicsClientWithBaseURI creates an instance of the TopicsClient client using a custom endpoint.  Use this when
+// interacting with an Azure cloud that uses a non-standard base URI (sovereign clouds, Azure stack).
 func NewTopicsClientWithBaseURI(baseURI string, subscriptionID string) TopicsClient {
 	return TopicsClient{NewWithBaseURI(baseURI, subscriptionID)}
 }
diff --git a/services/preview/eventgrid/mgmt/2017-09-15-preview/eventgrid/topictypes.go b/services/preview/eventgrid/mgmt/2017-09-15-preview/eventgrid/topictypes.go
index 7ca40d8fd26f..04f8880c3442 100644
--- a/services/preview/eventgrid/mgmt/2017-09-15-preview/eventgrid/topictypes.go
+++ b/services/preview/eventgrid/mgmt/2017-09-15-preview/eventgrid/topictypes.go
@@ -35,7 +35,8 @@ func NewTopicTypesClient(subscriptionID string) TopicTypesClient {
 	return NewTopicTypesClientWithBaseURI(DefaultBaseURI, subscriptionID)
 }
 
-// NewTopicTypesClientWithBaseURI creates an instance of the TopicTypesClient client.
+// NewTopicTypesClientWithBaseURI creates an instance of the TopicTypesClient client using a custom endpoint.  Use this
+// when interacting with an Azure cloud that uses a non-standard base URI (sovereign clouds, Azure stack).
 func NewTopicTypesClientWithBaseURI(baseURI string, subscriptionID string) TopicTypesClient {
 	return TopicTypesClient{NewWithBaseURI(baseURI, subscriptionID)}
 }