diff --git a/clients/client-ec2/src/models/models_0.ts b/clients/client-ec2/src/models/models_0.ts
index 96ad9497cb4c..12dd70d3a6db 100644
--- a/clients/client-ec2/src/models/models_0.ts
+++ b/clients/client-ec2/src/models/models_0.ts
@@ -862,10 +862,11 @@ export interface TransitGatewayVpcAttachmentOptions {
   DnsSupport?: DnsSupportValue;
 
   /**
-   * <note>
-   *             <p>This parameter is in preview and may not be available for your account.</p>
-   *          </note>
-   *          <p>Enables you to reference a security group across VPCs attached to a transit gateway. Use this option to simplify security group management and control of instance-to-instance traffic across VPCs that are connected by transit gateway. You can also use this option to migrate from VPC peering (which was the only option that supported security group referencing) to transit gateways (which now also support security group referencing). This option is disabled by default and there are no additional costs to use this feature.</p>
+   * <p>Enables you to reference a security group across VPCs attached to a transit gateway to simplify security group management.
+   *
+   * </p>
+   *          <p>This option is disabled by default.</p>
+   *          <p>For more information about security group referencing, see  <a href="https://docs.aws.amazon.com/vpc/latest/tgw/tgw-vpc-attachments.html#vpc-attachment-security">Security group referencing</a> in the <i>Amazon Web Services Transit Gateways Guide</i>.</p>
    * @public
    */
   SecurityGroupReferencingSupport?: SecurityGroupReferencingSupportValue;
diff --git a/clients/client-ec2/src/models/models_2.ts b/clients/client-ec2/src/models/models_2.ts
index 26b64260c41f..4896dc1ddbbb 100644
--- a/clients/client-ec2/src/models/models_2.ts
+++ b/clients/client-ec2/src/models/models_2.ts
@@ -3489,10 +3489,11 @@ export interface TransitGatewayRequestOptions {
   DnsSupport?: DnsSupportValue;
 
   /**
-   * <note>
-   *             <p>This parameter is in preview and may not be available for your account.</p>
-   *          </note>
-   *          <p>Enables you to reference a security group across VPCs attached to a transit gateway. Use this option to simplify security group management and control of instance-to-instance traffic across VPCs that are connected by transit gateway. You can also use this option to migrate from VPC peering (which was the only option that supported security group referencing) to transit gateways (which now also support security group referencing). This option is disabled by default and there are no additional costs to use this feature.</p>
+   * <p>Enables you to reference a security group across VPCs attached to a transit gateway to simplify security group management.
+   *
+   * </p>
+   *          <p>This option is disabled by default.</p>
+   *          <p>For more information about security group referencing, see  <a href="https://docs.aws.amazon.com/vpc/latest/tgw/tgw-vpc-attachments.html#vpc-attachment-security">Security group referencing</a> in the <i>Amazon Web Services Transit Gateways Guide</i>.</p>
    * @public
    */
   SecurityGroupReferencingSupport?: SecurityGroupReferencingSupportValue;
@@ -3602,10 +3603,9 @@ export interface TransitGatewayOptions {
   DnsSupport?: DnsSupportValue;
 
   /**
-   * <note>
-   *             <p>This parameter is in preview and may not be available for your account.</p>
-   *          </note>
-   *          <p>Enables you to reference a security group across VPCs attached to a transit gateway. Use this option to simplify security group management and control of instance-to-instance traffic across VPCs that are connected by transit gateway. You can also use this option to migrate from VPC peering (which was the only option that supported security group referencing) to transit gateways (which now also support security group referencing). This option is disabled by default and there are no additional costs to use this feature.</p>
+   * <p>Enables you to reference a security group across VPCs attached to a transit gateway to simplify security group management.</p>
+   *          <p>This option is enabled by default.</p>
+   *          <p>For more information about security group referencing, see  <a href="https://docs.aws.amazon.com/vpc/latest/tgw/tgw-vpc-attachments.html#vpc-attachment-security">Security group referencing</a> in the <i>Amazon Web Services Transit Gateways Guide</i>.</p>
    * @public
    */
   SecurityGroupReferencingSupport?: SecurityGroupReferencingSupportValue;
@@ -4952,13 +4952,14 @@ export interface CreateTransitGatewayVpcAttachmentRequestOptions {
   DnsSupport?: DnsSupportValue;
 
   /**
-   * <note>
-   *             <p>This parameter is in preview and may not be available for your account.</p>
-   *          </note>
-   *          <p>Enables you to reference a security group across VPCs attached to a transit gateway. Use this option to simplify security group management and control of instance-to-instance traffic across VPCs that are connected by transit gateway. You can also use this option to migrate from VPC peering (which was the only option that supported security group referencing) to transit gateways (which now also support security group referencing). This option is disabled by default and there are no additional costs to use this feature.</p>
+   * <p>Enables you to reference a security group across VPCs attached to a transit gateway to simplify security group management.
+   *
+   * </p>
+   *          <p>This option is disabled by default.</p>
    *          <p>If you don't enable or disable SecurityGroupReferencingSupport in the request, the
    *          attachment will inherit the security group referencing support setting on the transit
    *          gateway.</p>
+   *          <p>For more information about security group referencing, see  <a href="https://docs.aws.amazon.com/vpc/latest/tgw/tgw-vpc-attachments.html#vpc-attachment-security">Security group referencing </a> in the <i>Amazon Web Services Transit Gateways Guide</i>.</p>
    * @public
    */
   SecurityGroupReferencingSupport?: SecurityGroupReferencingSupportValue;
diff --git a/clients/client-ec2/src/models/models_6.ts b/clients/client-ec2/src/models/models_6.ts
index 91100c2d4a14..0d30b8917242 100644
--- a/clients/client-ec2/src/models/models_6.ts
+++ b/clients/client-ec2/src/models/models_6.ts
@@ -7895,10 +7895,11 @@ export interface ModifyTransitGatewayOptions {
   DnsSupport?: DnsSupportValue;
 
   /**
-   * <note>
-   *             <p>This parameter is in preview and may not be available for your account.</p>
-   *          </note>
-   *          <p>Enables you to reference a security group across VPCs attached to a transit gateway. Use this option to simplify security group management and control of instance-to-instance traffic across VPCs that are connected by transit gateway. You can also use this option to migrate from VPC peering (which was the only option that supported security group referencing) to transit gateways (which now also support security group referencing). This option is disabled by default and there are no additional costs to use this feature.</p>
+   * <p>Enables you to reference a security group across VPCs attached to a transit gateway to simplify security group management.
+   *
+   * </p>
+   *          <p>This option is disabled by default.</p>
+   *          <p>For more information about security group referencing, see  <a href="https://docs.aws.amazon.com/vpc/latest/tgw/tgw-vpc-attachments.html#vpc-attachment-security">Security group referencing</a> in the <i>Amazon Web Services Transit Gateways Guide</i>.</p>
    * @public
    */
   SecurityGroupReferencingSupport?: SecurityGroupReferencingSupportValue;
@@ -8060,10 +8061,11 @@ export interface ModifyTransitGatewayVpcAttachmentRequestOptions {
   DnsSupport?: DnsSupportValue;
 
   /**
-   * <note>
-   *             <p>This parameter is in preview and may not be available for your account.</p>
-   *          </note>
-   *          <p>Enables you to reference a security group across VPCs attached to a transit gateway. Use this option to simplify security group management and control of instance-to-instance traffic across VPCs that are connected by transit gateway. You can also use this option to migrate from VPC peering (which was the only option that supported security group referencing) to transit gateways (which now also support security group referencing). This option is disabled by default and there are no additional costs to use this feature.</p>
+   * <p>Enables you to reference a security group across VPCs attached to a transit gateway to simplify security group management.
+   *
+   * </p>
+   *          <p>This option is disabled by default.</p>
+   *          <p>For more information about security group referencing, see  <a href="https://docs.aws.amazon.com/vpc/latest/tgw/tgw-vpc-attachments.html#vpc-attachment-security">Security group referencing</a> in the <i>Amazon Web Services Transit Gateways Guide</i>.</p>
    * @public
    */
   SecurityGroupReferencingSupport?: SecurityGroupReferencingSupportValue;
diff --git a/codegen/sdk-codegen/aws-models/ec2.json b/codegen/sdk-codegen/aws-models/ec2.json
index 8d72cb08ecfe..382e9e61f13f 100644
--- a/codegen/sdk-codegen/aws-models/ec2.json
+++ b/codegen/sdk-codegen/aws-models/ec2.json
@@ -20431,7 +20431,7 @@
         "SecurityGroupReferencingSupport": {
           "target": "com.amazonaws.ec2#SecurityGroupReferencingSupportValue",
           "traits": {
-            "smithy.api#documentation": "<note>\n            <p>This parameter is in preview and may not be available for your account.</p>\n         </note>\n         <p>Enables you to reference a security group across VPCs attached to a transit gateway. Use this option to simplify security group management and control of instance-to-instance traffic across VPCs that are connected by transit gateway. You can also use this option to migrate from VPC peering (which was the only option that supported security group referencing) to transit gateways (which now also support security group referencing). This option is disabled by default and there are no additional costs to use this feature.</p>\n         <p>If you don't enable or disable SecurityGroupReferencingSupport in the request, the\n         attachment will inherit the security group referencing support setting on the transit\n         gateway.</p>"
+            "smithy.api#documentation": "<p>Enables you to reference a security group across VPCs attached to a transit gateway to simplify security group management.\n\n</p>\n         <p>This option is disabled by default.</p>\n         <p>If you don't enable or disable SecurityGroupReferencingSupport in the request, the\n         attachment will inherit the security group referencing support setting on the transit\n         gateway.</p>\n         <p>For more information about security group referencing, see  <a href=\"https://docs.aws.amazon.com/vpc/latest/tgw/tgw-vpc-attachments.html#vpc-attachment-security\">Security group referencing </a> in the <i>Amazon Web Services Transit Gateways Guide</i>.</p>"
           }
         },
         "Ipv6Support": {
@@ -78275,7 +78275,7 @@
         "SecurityGroupReferencingSupport": {
           "target": "com.amazonaws.ec2#SecurityGroupReferencingSupportValue",
           "traits": {
-            "smithy.api#documentation": "<note>\n            <p>This parameter is in preview and may not be available for your account.</p>\n         </note>\n         <p>Enables you to reference a security group across VPCs attached to a transit gateway. Use this option to simplify security group management and control of instance-to-instance traffic across VPCs that are connected by transit gateway. You can also use this option to migrate from VPC peering (which was the only option that supported security group referencing) to transit gateways (which now also support security group referencing). This option is disabled by default and there are no additional costs to use this feature.</p>"
+            "smithy.api#documentation": "<p>Enables you to reference a security group across VPCs attached to a transit gateway to simplify security group management.\n\n</p>\n         <p>This option is disabled by default.</p>\n         <p>For more information about security group referencing, see  <a href=\"https://docs.aws.amazon.com/vpc/latest/tgw/tgw-vpc-attachments.html#vpc-attachment-security\">Security group referencing</a> in the <i>Amazon Web Services Transit Gateways Guide</i>.</p>"
           }
         },
         "AutoAcceptSharedAttachments": {
@@ -78503,7 +78503,7 @@
         "SecurityGroupReferencingSupport": {
           "target": "com.amazonaws.ec2#SecurityGroupReferencingSupportValue",
           "traits": {
-            "smithy.api#documentation": "<note>\n            <p>This parameter is in preview and may not be available for your account.</p>\n         </note>\n         <p>Enables you to reference a security group across VPCs attached to a transit gateway. Use this option to simplify security group management and control of instance-to-instance traffic across VPCs that are connected by transit gateway. You can also use this option to migrate from VPC peering (which was the only option that supported security group referencing) to transit gateways (which now also support security group referencing). This option is disabled by default and there are no additional costs to use this feature.</p>"
+            "smithy.api#documentation": "<p>Enables you to reference a security group across VPCs attached to a transit gateway to simplify security group management.\n\n</p>\n         <p>This option is disabled by default.</p>\n         <p>For more information about security group referencing, see  <a href=\"https://docs.aws.amazon.com/vpc/latest/tgw/tgw-vpc-attachments.html#vpc-attachment-security\">Security group referencing</a> in the <i>Amazon Web Services Transit Gateways Guide</i>.</p>"
           }
         },
         "Ipv6Support": {
@@ -101993,7 +101993,7 @@
           "target": "com.amazonaws.ec2#SecurityGroupReferencingSupportValue",
           "traits": {
             "aws.protocols#ec2QueryName": "SecurityGroupReferencingSupport",
-            "smithy.api#documentation": "<note>\n            <p>This parameter is in preview and may not be available for your account.</p>\n         </note>\n         <p>Enables you to reference a security group across VPCs attached to a transit gateway. Use this option to simplify security group management and control of instance-to-instance traffic across VPCs that are connected by transit gateway. You can also use this option to migrate from VPC peering (which was the only option that supported security group referencing) to transit gateways (which now also support security group referencing). This option is disabled by default and there are no additional costs to use this feature.</p>",
+            "smithy.api#documentation": "<p>Enables you to reference a security group across VPCs attached to a transit gateway to simplify security group management.</p>\n         <p>This option is enabled by default.</p>\n         <p>For more information about security group referencing, see  <a href=\"https://docs.aws.amazon.com/vpc/latest/tgw/tgw-vpc-attachments.html#vpc-attachment-security\">Security group referencing</a> in the <i>Amazon Web Services Transit Gateways Guide</i>.</p>",
             "smithy.api#xmlName": "securityGroupReferencingSupport"
           }
         },
@@ -102644,7 +102644,7 @@
         "SecurityGroupReferencingSupport": {
           "target": "com.amazonaws.ec2#SecurityGroupReferencingSupportValue",
           "traits": {
-            "smithy.api#documentation": "<note>\n            <p>This parameter is in preview and may not be available for your account.</p>\n         </note>\n         <p>Enables you to reference a security group across VPCs attached to a transit gateway. Use this option to simplify security group management and control of instance-to-instance traffic across VPCs that are connected by transit gateway. You can also use this option to migrate from VPC peering (which was the only option that supported security group referencing) to transit gateways (which now also support security group referencing). This option is disabled by default and there are no additional costs to use this feature.</p>"
+            "smithy.api#documentation": "<p>Enables you to reference a security group across VPCs attached to a transit gateway to simplify security group management.\n\n</p>\n         <p>This option is disabled by default.</p>\n         <p>For more information about security group referencing, see  <a href=\"https://docs.aws.amazon.com/vpc/latest/tgw/tgw-vpc-attachments.html#vpc-attachment-security\">Security group referencing</a> in the <i>Amazon Web Services Transit Gateways Guide</i>.</p>"
           }
         },
         "MulticastSupport": {
@@ -103429,7 +103429,7 @@
           "target": "com.amazonaws.ec2#SecurityGroupReferencingSupportValue",
           "traits": {
             "aws.protocols#ec2QueryName": "SecurityGroupReferencingSupport",
-            "smithy.api#documentation": "<note>\n            <p>This parameter is in preview and may not be available for your account.</p>\n         </note>\n         <p>Enables you to reference a security group across VPCs attached to a transit gateway. Use this option to simplify security group management and control of instance-to-instance traffic across VPCs that are connected by transit gateway. You can also use this option to migrate from VPC peering (which was the only option that supported security group referencing) to transit gateways (which now also support security group referencing). This option is disabled by default and there are no additional costs to use this feature.</p>",
+            "smithy.api#documentation": "<p>Enables you to reference a security group across VPCs attached to a transit gateway to simplify security group management.\n\n</p>\n         <p>This option is disabled by default.</p>\n         <p>For more information about security group referencing, see  <a href=\"https://docs.aws.amazon.com/vpc/latest/tgw/tgw-vpc-attachments.html#vpc-attachment-security\">Security group referencing</a> in the <i>Amazon Web Services Transit Gateways Guide</i>.</p>",
             "smithy.api#xmlName": "securityGroupReferencingSupport"
           }
         },