diff --git a/clients/client-rds/src/models/models_0.ts b/clients/client-rds/src/models/models_0.ts
index daafd5a43b83..d2e9a4f33f6f 100644
--- a/clients/client-rds/src/models/models_0.ts
+++ b/clients/client-rds/src/models/models_0.ts
@@ -7011,14 +7011,19 @@ export interface CreateDBInstanceMessage {
    *             </dd>
    *             <dt>RDS for Db2</dt>
    *             <dd>
-   *                <p>The name of the database to create when the DB instance is created. If this parameter isn't specified, no database is created in the DB instance.</p>
+   *                <p>The name of the database to create when the DB instance is created. If
+   *                         this parameter isn't specified, no database is created in the DB instance.
+   *                         In some cases, we recommend that you don't add a database name. For more
+   *                         information, see <a href="https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/db2-db-instance-prereqs.html#db2-prereqs-additional-considerations">Additional considerations</a> in the <i>Amazon RDS User
+   *                             Guide</i>.</p>
    *                <p>Constraints:</p>
    *                <ul>
    *                   <li>
    *                      <p>Must contain 1 to 64 letters or numbers.</p>
    *                   </li>
    *                   <li>
-   *                      <p>Must begin with a letter. Subsequent characters can be letters, underscores, or digits (0-9).</p>
+   *                      <p>Must begin with a letter. Subsequent characters can be letters,
+   *                                 underscores, or digits (0-9).</p>
    *                   </li>
    *                   <li>
    *                      <p>Can't be a word reserved by the specified database engine.</p>
diff --git a/clients/client-rds/src/models/models_1.ts b/clients/client-rds/src/models/models_1.ts
index 57e33038d7e9..ff9729959615 100644
--- a/clients/client-rds/src/models/models_1.ts
+++ b/clients/client-rds/src/models/models_1.ts
@@ -4772,7 +4772,9 @@ export interface DescribeGlobalClustersMessage {
 
   /**
    * @public
-   * <p>This parameter isn't currently supported.</p>
+   * <p>A filter that specifies one or more global database clusters to describe. This parameter is case-sensitive.</p>
+   *          <p>Currently, the only supported filter is <code>region</code>.</p>
+   *          <p>If used, the request returns information about any global cluster with at least one member (primary or secondary) in the specified Amazon Web Services Regions.</p>
    */
   Filters?: Filter[];
 
diff --git a/codegen/sdk-codegen/aws-models/rds.json b/codegen/sdk-codegen/aws-models/rds.json
index b6c0183905e4..479731edd196 100644
--- a/codegen/sdk-codegen/aws-models/rds.json
+++ b/codegen/sdk-codegen/aws-models/rds.json
@@ -4862,7 +4862,7 @@
         "DBName": {
           "target": "com.amazonaws.rds#String",
           "traits": {
-            "smithy.api#documentation": "<p>The meaning of this parameter differs according to the database engine you use.</p>\n         <dl>\n            <dt>Amazon Aurora MySQL</dt>\n            <dd>\n               <p>The name of the database to create when the primary DB instance of the Aurora MySQL DB cluster is\n                  created. If this parameter isn't specified for an Aurora MySQL DB cluster, no database is created \n                  in the DB cluster.</p>\n               <p>Constraints:</p>\n               <ul>\n                  <li>\n                     <p>Must contain 1 to 64 alphanumeric characters.</p>\n                  </li>\n                  <li>\n                     <p>Can't be a word reserved by the database engine.</p>\n                  </li>\n               </ul>\n            </dd>\n            <dt>Amazon Aurora PostgreSQL</dt>\n            <dd>\n               <p>The name of the database to create when the primary DB instance of the Aurora PostgreSQL DB cluster is\n                  created. If this parameter isn't specified for an Aurora PostgreSQL DB cluster, \n                  a database named <code>postgres</code> is created in the DB cluster.</p>\n               <p>Constraints:</p>\n               <ul>\n                  <li>\n                     <p>It must contain 1 to 63 alphanumeric characters.</p>\n                  </li>\n                  <li>\n                     <p>Must begin with a letter. Subsequent characters can be letters, underscores, or digits\n                          (0 to 9).</p>\n                  </li>\n                  <li>\n                     <p>Can't be a word reserved by the database engine.</p>\n                  </li>\n               </ul>\n            </dd>\n            <dt>Amazon RDS Custom for Oracle</dt>\n            <dd>\n               <p>The Oracle System ID (SID) of the created RDS Custom DB instance. If you don't specify a value, the default value is <code>ORCL</code> for non-CDBs and\n                <code>RDSCDB</code> for CDBs.</p>\n               <p>Default: <code>ORCL</code>\n               </p>\n               <p>Constraints:</p>\n               <ul>\n                  <li>\n                     <p>Must contain 1 to 8 alphanumeric characters.</p>\n                  </li>\n                  <li>\n                     <p>Must contain a letter.</p>\n                  </li>\n                  <li>\n                     <p>Can't be a word reserved by the database engine.</p>\n                  </li>\n               </ul>\n            </dd>\n            <dt>Amazon RDS Custom for SQL Server</dt>\n            <dd>\n               <p>Not applicable. Must be null.</p>\n            </dd>\n            <dt>RDS for Db2</dt>\n            <dd>\n               <p>The name of the database to create when the DB instance is created. If this parameter isn't specified, no database is created in the DB instance.</p>\n               <p>Constraints:</p>\n               <ul>\n                  <li>\n                     <p>Must contain 1 to 64 letters or numbers.</p>\n                  </li>\n                  <li>\n                     <p>Must begin with a letter. Subsequent characters can be letters, underscores, or digits (0-9).</p>\n                  </li>\n                  <li>\n                     <p>Can't be a word reserved by the specified database engine.</p>\n                  </li>\n               </ul>\n            </dd>\n            <dt>RDS for MariaDB</dt>\n            <dd>\n               <p>The name of the database to create when the DB instance is created. If this parameter isn't specified, no database is created in the DB instance.</p>\n               <p>Constraints:</p>\n               <ul>\n                  <li>\n                     <p>Must contain 1 to 64 letters or numbers.</p>\n                  </li>\n                  <li>\n                     <p>Must begin with a letter. Subsequent characters can be letters, underscores, or digits (0-9).</p>\n                  </li>\n                  <li>\n                     <p>Can't be a word reserved by the specified database engine.</p>\n                  </li>\n               </ul>\n            </dd>\n            <dt>RDS for MySQL</dt>\n            <dd>\n               <p>The name of the database to create when the DB instance is created. If this parameter isn't specified, no database is created in the DB instance.</p>\n               <p>Constraints:</p>\n               <ul>\n                  <li>\n                     <p>Must contain 1 to 64 letters or numbers.</p>\n                  </li>\n                  <li>\n                     <p>Must begin with a letter. Subsequent characters can be letters, underscores, or digits (0-9).</p>\n                  </li>\n                  <li>\n                     <p>Can't be a word reserved by the specified database engine.</p>\n                  </li>\n               </ul>\n            </dd>\n            <dt>RDS for Oracle</dt>\n            <dd>\n               <p>The Oracle System ID (SID) of the created DB instance. If you don't specify a value, \n                    the default value is <code>ORCL</code>. You can't specify the \n                    string <code>null</code>, or any other reserved word, for <code>DBName</code>.</p>\n               <p>Default: <code>ORCL</code>\n               </p>\n               <p>Constraints:</p>\n               <ul>\n                  <li>\n                     <p>Can't be longer than 8 characters.</p>\n                  </li>\n               </ul>\n            </dd>\n            <dt>RDS for PostgreSQL</dt>\n            <dd>\n               <p>The name of the database to create when the DB instance is created. If this parameter isn't specified, a database named <code>postgres</code> \n                  is created in the DB instance.</p>\n               <p>Constraints:</p>\n               <ul>\n                  <li>\n                     <p>Must contain 1 to 63 letters, numbers, or underscores.</p>\n                  </li>\n                  <li>\n                     <p>Must begin with a letter. Subsequent characters can be letters, underscores, or digits (0-9).</p>\n                  </li>\n                  <li>\n                     <p>Can't be a word reserved by the specified database engine.</p>\n                  </li>\n               </ul>\n            </dd>\n            <dt>RDS for SQL Server</dt>\n            <dd>\n               <p>Not applicable. Must be null.</p>\n            </dd>\n         </dl>"
+            "smithy.api#documentation": "<p>The meaning of this parameter differs according to the database engine you use.</p>\n         <dl>\n            <dt>Amazon Aurora MySQL</dt>\n            <dd>\n               <p>The name of the database to create when the primary DB instance of the Aurora MySQL DB cluster is\n                  created. If this parameter isn't specified for an Aurora MySQL DB cluster, no database is created \n                  in the DB cluster.</p>\n               <p>Constraints:</p>\n               <ul>\n                  <li>\n                     <p>Must contain 1 to 64 alphanumeric characters.</p>\n                  </li>\n                  <li>\n                     <p>Can't be a word reserved by the database engine.</p>\n                  </li>\n               </ul>\n            </dd>\n            <dt>Amazon Aurora PostgreSQL</dt>\n            <dd>\n               <p>The name of the database to create when the primary DB instance of the Aurora PostgreSQL DB cluster is\n                  created. If this parameter isn't specified for an Aurora PostgreSQL DB cluster, \n                  a database named <code>postgres</code> is created in the DB cluster.</p>\n               <p>Constraints:</p>\n               <ul>\n                  <li>\n                     <p>It must contain 1 to 63 alphanumeric characters.</p>\n                  </li>\n                  <li>\n                     <p>Must begin with a letter. Subsequent characters can be letters, underscores, or digits\n                          (0 to 9).</p>\n                  </li>\n                  <li>\n                     <p>Can't be a word reserved by the database engine.</p>\n                  </li>\n               </ul>\n            </dd>\n            <dt>Amazon RDS Custom for Oracle</dt>\n            <dd>\n               <p>The Oracle System ID (SID) of the created RDS Custom DB instance. If you don't specify a value, the default value is <code>ORCL</code> for non-CDBs and\n                <code>RDSCDB</code> for CDBs.</p>\n               <p>Default: <code>ORCL</code>\n               </p>\n               <p>Constraints:</p>\n               <ul>\n                  <li>\n                     <p>Must contain 1 to 8 alphanumeric characters.</p>\n                  </li>\n                  <li>\n                     <p>Must contain a letter.</p>\n                  </li>\n                  <li>\n                     <p>Can't be a word reserved by the database engine.</p>\n                  </li>\n               </ul>\n            </dd>\n            <dt>Amazon RDS Custom for SQL Server</dt>\n            <dd>\n               <p>Not applicable. Must be null.</p>\n            </dd>\n            <dt>RDS for Db2</dt>\n            <dd>\n               <p>The name of the database to create when the DB instance is created. If\n                        this parameter isn't specified, no database is created in the DB instance.\n                        In some cases, we recommend that you don't add a database name. For more\n                        information, see <a href=\"https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/db2-db-instance-prereqs.html#db2-prereqs-additional-considerations\">Additional considerations</a> in the <i>Amazon RDS User\n                            Guide</i>.</p>\n               <p>Constraints:</p>\n               <ul>\n                  <li>\n                     <p>Must contain 1 to 64 letters or numbers.</p>\n                  </li>\n                  <li>\n                     <p>Must begin with a letter. Subsequent characters can be letters,\n                                underscores, or digits (0-9).</p>\n                  </li>\n                  <li>\n                     <p>Can't be a word reserved by the specified database engine.</p>\n                  </li>\n               </ul>\n            </dd>\n            <dt>RDS for MariaDB</dt>\n            <dd>\n               <p>The name of the database to create when the DB instance is created. If this parameter isn't specified, no database is created in the DB instance.</p>\n               <p>Constraints:</p>\n               <ul>\n                  <li>\n                     <p>Must contain 1 to 64 letters or numbers.</p>\n                  </li>\n                  <li>\n                     <p>Must begin with a letter. Subsequent characters can be letters, underscores, or digits (0-9).</p>\n                  </li>\n                  <li>\n                     <p>Can't be a word reserved by the specified database engine.</p>\n                  </li>\n               </ul>\n            </dd>\n            <dt>RDS for MySQL</dt>\n            <dd>\n               <p>The name of the database to create when the DB instance is created. If this parameter isn't specified, no database is created in the DB instance.</p>\n               <p>Constraints:</p>\n               <ul>\n                  <li>\n                     <p>Must contain 1 to 64 letters or numbers.</p>\n                  </li>\n                  <li>\n                     <p>Must begin with a letter. Subsequent characters can be letters, underscores, or digits (0-9).</p>\n                  </li>\n                  <li>\n                     <p>Can't be a word reserved by the specified database engine.</p>\n                  </li>\n               </ul>\n            </dd>\n            <dt>RDS for Oracle</dt>\n            <dd>\n               <p>The Oracle System ID (SID) of the created DB instance. If you don't specify a value, \n                    the default value is <code>ORCL</code>. You can't specify the \n                    string <code>null</code>, or any other reserved word, for <code>DBName</code>.</p>\n               <p>Default: <code>ORCL</code>\n               </p>\n               <p>Constraints:</p>\n               <ul>\n                  <li>\n                     <p>Can't be longer than 8 characters.</p>\n                  </li>\n               </ul>\n            </dd>\n            <dt>RDS for PostgreSQL</dt>\n            <dd>\n               <p>The name of the database to create when the DB instance is created. If this parameter isn't specified, a database named <code>postgres</code> \n                  is created in the DB instance.</p>\n               <p>Constraints:</p>\n               <ul>\n                  <li>\n                     <p>Must contain 1 to 63 letters, numbers, or underscores.</p>\n                  </li>\n                  <li>\n                     <p>Must begin with a letter. Subsequent characters can be letters, underscores, or digits (0-9).</p>\n                  </li>\n                  <li>\n                     <p>Can't be a word reserved by the specified database engine.</p>\n                  </li>\n               </ul>\n            </dd>\n            <dt>RDS for SQL Server</dt>\n            <dd>\n               <p>Not applicable. Must be null.</p>\n            </dd>\n         </dl>"
           }
         },
         "DBInstanceIdentifier": {
@@ -16849,7 +16849,7 @@
         "Filters": {
           "target": "com.amazonaws.rds#FilterList",
           "traits": {
-            "smithy.api#documentation": "<p>This parameter isn't currently supported.</p>"
+            "smithy.api#documentation": "<p>A filter that specifies one or more global database clusters to describe. This parameter is case-sensitive.</p>\n         <p>Currently, the only supported filter is <code>region</code>.</p>\n         <p>If used, the request returns information about any global cluster with at least one member (primary or secondary) in the specified Amazon Web Services Regions.</p>"
           }
         },
         "MaxRecords": {