diff --git a/clients/client-rds/src/models/models_0.ts b/clients/client-rds/src/models/models_0.ts
index 8799257a949a..daafd5a43b83 100644
--- a/clients/client-rds/src/models/models_0.ts
+++ b/clients/client-rds/src/models/models_0.ts
@@ -4897,7 +4897,7 @@ export interface CreateDBClusterMessage {
    *                </p>
    *             </li>
    *             <li>
-   *                <p>Multi-AZ DB clusters - <code>io1</code>
+   *                <p>Multi-AZ DB clusters - <code>io1 | io2 | gp3</code>
    *                </p>
    *             </li>
    *          </ul>
@@ -5133,6 +5133,8 @@ export interface CreateDBClusterMessage {
   /**
    * @public
    * <p>The CA certificate identifier to use for the DB cluster's server certificate.</p>
+   *          <p>For more information, see <a href="https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/UsingWithRDS.SSL.html">Using SSL/TLS to encrypt a connection to a DB
+   *             instance</a> in the <i>Amazon RDS User Guide</i>.</p>
    *          <p>Valid for Cluster Type: Multi-AZ DB clusters</p>
    */
   CACertificateIdentifier?: string;
diff --git a/clients/client-rds/src/models/models_1.ts b/clients/client-rds/src/models/models_1.ts
index c455f6afb327..57e33038d7e9 100644
--- a/clients/client-rds/src/models/models_1.ts
+++ b/clients/client-rds/src/models/models_1.ts
@@ -7681,7 +7681,7 @@ export interface ModifyDBClusterMessage {
    *                </p>
    *             </li>
    *             <li>
-   *                <p>Multi-AZ DB clusters - <code>io1</code>
+   *                <p>Multi-AZ DB clusters - <code>io1 | io2 | gp3</code>
    *                </p>
    *             </li>
    *          </ul>
@@ -7938,6 +7938,8 @@ export interface ModifyDBClusterMessage {
   /**
    * @public
    * <p>The CA certificate identifier to use for the DB cluster's server certificate.</p>
+   *          <p>For more information, see <a href="https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/UsingWithRDS.SSL.html">Using SSL/TLS to encrypt a connection to a DB
+   *             instance</a> in the <i>Amazon RDS User Guide</i>.</p>
    *          <p>Valid for Cluster Type: Multi-AZ DB clusters</p>
    */
   CACertificateIdentifier?: string;
@@ -8653,7 +8655,7 @@ export interface ModifyDBInstanceMessage {
   /**
    * @public
    * <p>The storage type to associate with the DB instance.</p>
-   *          <p>If you specify <code>io1</code>), <code>io2</code>, or <code>gp3</code>
+   *          <p>If you specify <code>io1</code>, <code>io2</code>, or <code>gp3</code>
    *           you must also include a value for the <code>Iops</code> parameter.</p>
    *          <p>If you choose to migrate your DB instance from using standard storage to using
    *             Provisioned IOPS, or from using Provisioned IOPS to using standard storage, the process
diff --git a/codegen/sdk-codegen/aws-models/rds.json b/codegen/sdk-codegen/aws-models/rds.json
index 3e932de0eb0d..b6c0183905e4 100644
--- a/codegen/sdk-codegen/aws-models/rds.json
+++ b/codegen/sdk-codegen/aws-models/rds.json
@@ -4366,7 +4366,7 @@
         "StorageType": {
           "target": "com.amazonaws.rds#String",
           "traits": {
-            "smithy.api#documentation": "<p>The storage type to associate with the DB cluster.</p>\n         <p>For information on storage types for Aurora DB clusters, see <a href=\"https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/Aurora.Overview.StorageReliability.html#aurora-storage-type\">Storage configurations for Amazon Aurora DB clusters</a>. For information on storage types for Multi-AZ DB\n            clusters, see <a href=\"https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/create-multi-az-db-cluster.html#create-multi-az-db-cluster-settings\">Settings for creating Multi-AZ DB clusters</a>.</p>\n         <p>This setting is required to create a Multi-AZ DB cluster.</p>\n         <p>When specified for a Multi-AZ DB cluster, a value for the <code>Iops</code> parameter is required.</p>\n         <p>Valid for Cluster Type: Aurora DB clusters and Multi-AZ DB clusters</p>\n         <p>Valid Values:</p>\n         <ul>\n            <li>\n               <p>Aurora DB clusters - <code>aurora | aurora-iopt1</code>\n               </p>\n            </li>\n            <li>\n               <p>Multi-AZ DB clusters - <code>io1</code>\n               </p>\n            </li>\n         </ul>\n         <p>Default:</p>\n         <ul>\n            <li>\n               <p>Aurora DB clusters - <code>aurora</code>\n               </p>\n            </li>\n            <li>\n               <p>Multi-AZ DB clusters - <code>io1</code>\n               </p>\n            </li>\n         </ul>\n         <note>\n            <p>When you create an Aurora DB cluster with the storage type set to <code>aurora-iopt1</code>, the storage type is returned\n                in the response. The storage type isn't returned when you set it to <code>aurora</code>.</p>\n         </note>"
+            "smithy.api#documentation": "<p>The storage type to associate with the DB cluster.</p>\n         <p>For information on storage types for Aurora DB clusters, see <a href=\"https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/Aurora.Overview.StorageReliability.html#aurora-storage-type\">Storage configurations for Amazon Aurora DB clusters</a>. For information on storage types for Multi-AZ DB\n            clusters, see <a href=\"https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/create-multi-az-db-cluster.html#create-multi-az-db-cluster-settings\">Settings for creating Multi-AZ DB clusters</a>.</p>\n         <p>This setting is required to create a Multi-AZ DB cluster.</p>\n         <p>When specified for a Multi-AZ DB cluster, a value for the <code>Iops</code> parameter is required.</p>\n         <p>Valid for Cluster Type: Aurora DB clusters and Multi-AZ DB clusters</p>\n         <p>Valid Values:</p>\n         <ul>\n            <li>\n               <p>Aurora DB clusters - <code>aurora | aurora-iopt1</code>\n               </p>\n            </li>\n            <li>\n               <p>Multi-AZ DB clusters - <code>io1 | io2 | gp3</code>\n               </p>\n            </li>\n         </ul>\n         <p>Default:</p>\n         <ul>\n            <li>\n               <p>Aurora DB clusters - <code>aurora</code>\n               </p>\n            </li>\n            <li>\n               <p>Multi-AZ DB clusters - <code>io1</code>\n               </p>\n            </li>\n         </ul>\n         <note>\n            <p>When you create an Aurora DB cluster with the storage type set to <code>aurora-iopt1</code>, the storage type is returned\n                in the response. The storage type isn't returned when you set it to <code>aurora</code>.</p>\n         </note>"
           }
         },
         "Iops": {
@@ -4459,7 +4459,7 @@
         "CACertificateIdentifier": {
           "target": "com.amazonaws.rds#String",
           "traits": {
-            "smithy.api#documentation": "<p>The CA certificate identifier to use for the DB cluster's server certificate.</p>\n         <p>Valid for Cluster Type: Multi-AZ DB clusters</p>"
+            "smithy.api#documentation": "<p>The CA certificate identifier to use for the DB cluster's server certificate.</p>\n         <p>For more information, see <a href=\"https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/UsingWithRDS.SSL.html\">Using SSL/TLS to encrypt a connection to a DB \n            instance</a> in the <i>Amazon RDS User Guide</i>.</p>\n         <p>Valid for Cluster Type: Multi-AZ DB clusters</p>"
           }
         }
       },
@@ -21449,7 +21449,7 @@
         "StorageType": {
           "target": "com.amazonaws.rds#String",
           "traits": {
-            "smithy.api#documentation": "<p>The storage type to associate with the DB cluster.</p>\n         <p>For information on storage types for Aurora DB clusters, see <a href=\"https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/Aurora.Overview.StorageReliability.html#aurora-storage-type\">Storage configurations for Amazon Aurora DB clusters</a>. For information on storage types for Multi-AZ DB\n            clusters, see <a href=\"https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/create-multi-az-db-cluster.html#create-multi-az-db-cluster-settings\">Settings for creating Multi-AZ DB clusters</a>.</p>\n         <p>When specified for a Multi-AZ DB cluster, a value for the <code>Iops</code> parameter is required.</p>\n         <p>Valid for Cluster Type: Aurora DB clusters and Multi-AZ DB clusters</p>\n         <p>Valid Values:</p>\n         <ul>\n            <li>\n               <p>Aurora DB clusters - <code>aurora | aurora-iopt1</code>\n               </p>\n            </li>\n            <li>\n               <p>Multi-AZ DB clusters - <code>io1</code>\n               </p>\n            </li>\n         </ul>\n         <p>Default:</p>\n         <ul>\n            <li>\n               <p>Aurora DB clusters - <code>aurora</code>\n               </p>\n            </li>\n            <li>\n               <p>Multi-AZ DB clusters - <code>io1</code>\n               </p>\n            </li>\n         </ul>"
+            "smithy.api#documentation": "<p>The storage type to associate with the DB cluster.</p>\n         <p>For information on storage types for Aurora DB clusters, see <a href=\"https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/Aurora.Overview.StorageReliability.html#aurora-storage-type\">Storage configurations for Amazon Aurora DB clusters</a>. For information on storage types for Multi-AZ DB\n            clusters, see <a href=\"https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/create-multi-az-db-cluster.html#create-multi-az-db-cluster-settings\">Settings for creating Multi-AZ DB clusters</a>.</p>\n         <p>When specified for a Multi-AZ DB cluster, a value for the <code>Iops</code> parameter is required.</p>\n         <p>Valid for Cluster Type: Aurora DB clusters and Multi-AZ DB clusters</p>\n         <p>Valid Values:</p>\n         <ul>\n            <li>\n               <p>Aurora DB clusters - <code>aurora | aurora-iopt1</code>\n               </p>\n            </li>\n            <li>\n               <p>Multi-AZ DB clusters - <code>io1 | io2 | gp3</code>\n               </p>\n            </li>\n         </ul>\n         <p>Default:</p>\n         <ul>\n            <li>\n               <p>Aurora DB clusters - <code>aurora</code>\n               </p>\n            </li>\n            <li>\n               <p>Multi-AZ DB clusters - <code>io1</code>\n               </p>\n            </li>\n         </ul>"
           }
         },
         "Iops": {
@@ -21554,7 +21554,7 @@
         "CACertificateIdentifier": {
           "target": "com.amazonaws.rds#String",
           "traits": {
-            "smithy.api#documentation": "<p>The CA certificate identifier to use for the DB cluster's server certificate.</p>\n         <p>Valid for Cluster Type: Multi-AZ DB clusters</p>"
+            "smithy.api#documentation": "<p>The CA certificate identifier to use for the DB cluster's server certificate.</p>\n         <p>For more information, see <a href=\"https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/UsingWithRDS.SSL.html\">Using SSL/TLS to encrypt a connection to a DB \n            instance</a> in the <i>Amazon RDS User Guide</i>.</p>\n         <p>Valid for Cluster Type: Multi-AZ DB clusters</p>"
           }
         }
       },
@@ -21986,7 +21986,7 @@
         "StorageType": {
           "target": "com.amazonaws.rds#String",
           "traits": {
-            "smithy.api#documentation": "<p>The storage type to associate with the DB instance.</p>\n         <p>If you specify <code>io1</code>), <code>io2</code>, or <code>gp3</code> \n          you must also include a value for the <code>Iops</code> parameter.</p>\n         <p>If you choose to migrate your DB instance from using standard storage to using\n            Provisioned IOPS, or from using Provisioned IOPS to using standard storage, the process\n            can take time. The duration of the migration depends on several factors such as database\n            load, storage size, storage type (standard or Provisioned IOPS), amount of IOPS\n            provisioned (if any), and the number of prior scale storage operations. Typical\n            migration times are under 24 hours, but the process can take up to several days in some\n            cases. During the migration, the DB instance is available for use, but might experience\n            performance degradation. While the migration takes place, nightly backups for the\n            instance are suspended. No other Amazon RDS operations can take place for the instance,\n            including modifying the instance, rebooting the instance, deleting the instance,\n            creating a read replica for the instance, and creating a DB snapshot of the instance.</p>\n         <p>Valid Values: <code>gp2 | gp3 | io1 | io2 | standard</code>\n         </p>\n         <p>Default: <code>io1</code>, if the <code>Iops</code> parameter\n          is specified. Otherwise, <code>gp2</code>.</p>"
+            "smithy.api#documentation": "<p>The storage type to associate with the DB instance.</p>\n         <p>If you specify <code>io1</code>, <code>io2</code>, or <code>gp3</code> \n          you must also include a value for the <code>Iops</code> parameter.</p>\n         <p>If you choose to migrate your DB instance from using standard storage to using\n            Provisioned IOPS, or from using Provisioned IOPS to using standard storage, the process\n            can take time. The duration of the migration depends on several factors such as database\n            load, storage size, storage type (standard or Provisioned IOPS), amount of IOPS\n            provisioned (if any), and the number of prior scale storage operations. Typical\n            migration times are under 24 hours, but the process can take up to several days in some\n            cases. During the migration, the DB instance is available for use, but might experience\n            performance degradation. While the migration takes place, nightly backups for the\n            instance are suspended. No other Amazon RDS operations can take place for the instance,\n            including modifying the instance, rebooting the instance, deleting the instance,\n            creating a read replica for the instance, and creating a DB snapshot of the instance.</p>\n         <p>Valid Values: <code>gp2 | gp3 | io1 | io2 | standard</code>\n         </p>\n         <p>Default: <code>io1</code>, if the <code>Iops</code> parameter\n          is specified. Otherwise, <code>gp2</code>.</p>"
           }
         },
         "TdeCredentialArn": {