diff --git a/clients/client-redshift/src/models/models_1.ts b/clients/client-redshift/src/models/models_1.ts
index 373ba9781f04..d3a07bc73874 100644
--- a/clients/client-redshift/src/models/models_1.ts
+++ b/clients/client-redshift/src/models/models_1.ts
@@ -2814,33 +2814,9 @@ export interface EnableLoggingMessage {
 
   /**
    * <p>The prefix applied to the log file names.</p>
-   *          <p>Constraints:</p>
-   *          <ul>
-   *             <li>
-   *                <p>Cannot exceed 512 characters</p>
-   *             </li>
-   *             <li>
-   *                <p>Cannot contain spaces( ), double quotes ("), single quotes ('), a backslash
-   *                     (\), or control characters. The hexadecimal codes for invalid characters are: </p>
-   *                <ul>
-   *                   <li>
-   *                      <p>x00 to x20</p>
-   *                   </li>
-   *                   <li>
-   *                      <p>x22</p>
-   *                   </li>
-   *                   <li>
-   *                      <p>x27</p>
-   *                   </li>
-   *                   <li>
-   *                      <p>x5c</p>
-   *                   </li>
-   *                   <li>
-   *                      <p>x7f or larger</p>
-   *                   </li>
-   *                </ul>
-   *             </li>
-   *          </ul>
+   *          <p>Valid characters are any letter from any language, any whitespace character, any numeric character, and the following characters:
+   *             underscore (<code>_</code>), period (<code>.</code>), colon (<code>:</code>), slash (<code>/</code>), equal (<code>=</code>), plus (<code>+</code>), backslash (<code>\</code>),
+   *             hyphen (<code>-</code>), at symbol (<code>@</code>).</p>
    * @public
    */
   S3KeyPrefix?: string;
diff --git a/codegen/sdk-codegen/aws-models/redshift.json b/codegen/sdk-codegen/aws-models/redshift.json
index 16bce5a6766d..6f8c10703599 100644
--- a/codegen/sdk-codegen/aws-models/redshift.json
+++ b/codegen/sdk-codegen/aws-models/redshift.json
@@ -8504,9 +8504,9 @@
           }
         },
         "S3KeyPrefix": {
-          "target": "com.amazonaws.redshift#String",
+          "target": "com.amazonaws.redshift#S3KeyPrefixValue",
           "traits": {
-            "smithy.api#documentation": "<p>The prefix applied to the log file names.</p>\n         <p>Constraints:</p>\n         <ul>\n            <li>\n               <p>Cannot exceed 512 characters</p>\n            </li>\n            <li>\n               <p>Cannot contain spaces( ), double quotes (\"), single quotes ('), a backslash\n                    (\\), or control characters. The hexadecimal codes for invalid characters are: </p>\n               <ul>\n                  <li>\n                     <p>x00 to x20</p>\n                  </li>\n                  <li>\n                     <p>x22</p>\n                  </li>\n                  <li>\n                     <p>x27</p>\n                  </li>\n                  <li>\n                     <p>x5c</p>\n                  </li>\n                  <li>\n                     <p>x7f or larger</p>\n                  </li>\n               </ul>\n            </li>\n         </ul>"
+            "smithy.api#documentation": "<p>The prefix applied to the log file names.</p>\n         <p>Valid characters are any letter from any language, any whitespace character, any numeric character, and the following characters: \n            underscore (<code>_</code>), period (<code>.</code>), colon (<code>:</code>), slash (<code>/</code>), equal (<code>=</code>), plus (<code>+</code>), backslash (<code>\\</code>),\n            hyphen (<code>-</code>), at symbol (<code>@</code>).</p>"
           }
         },
         "LogDestinationType": {
@@ -10932,7 +10932,7 @@
           }
         },
         "S3KeyPrefix": {
-          "target": "com.amazonaws.redshift#String",
+          "target": "com.amazonaws.redshift#S3KeyPrefixValue",
           "traits": {
             "smithy.api#documentation": "<p>The prefix applied to the log file names.</p>"
           }
@@ -16910,6 +16910,16 @@
         "smithy.api#output": {}
       }
     },
+    "com.amazonaws.redshift#S3KeyPrefixValue": {
+      "type": "string",
+      "traits": {
+        "smithy.api#length": {
+          "min": 0,
+          "max": 256
+        },
+        "smithy.api#pattern": "^[\\p{L}\\p{Z}\\p{N}_.:/=+\\-@]*$"
+      }
+    },
     "com.amazonaws.redshift#SNSInvalidTopicFault": {
       "type": "structure",
       "members": {