diff --git a/clients/client-s3outposts/src/commands/ListOutpostsWithS3Command.ts b/clients/client-s3outposts/src/commands/ListOutpostsWithS3Command.ts
index b11ee7656cb0..82363b7448ca 100644
--- a/clients/client-s3outposts/src/commands/ListOutpostsWithS3Command.ts
+++ b/clients/client-s3outposts/src/commands/ListOutpostsWithS3Command.ts
@@ -56,6 +56,7 @@ export interface ListOutpostsWithS3CommandOutput extends ListOutpostsWithS3Resul
  * //   Outposts: [ // Outposts
  * //     { // Outpost
  * //       OutpostArn: "STRING_VALUE",
+ * //       S3OutpostArn: "STRING_VALUE",
  * //       OutpostId: "STRING_VALUE",
  * //       OwnerId: "STRING_VALUE",
  * //       CapacityInBytes: Number("long"),
diff --git a/clients/client-s3outposts/src/models/models_0.ts b/clients/client-s3outposts/src/models/models_0.ts
index 44ab3a426701..0fec32c0169d 100644
--- a/clients/client-s3outposts/src/models/models_0.ts
+++ b/clients/client-s3outposts/src/models/models_0.ts
@@ -439,6 +439,12 @@ export interface Outpost {
    */
   OutpostArn?: string;
 
+  /**
+   * @public
+   * <p>Specifies the unique S3 on Outposts ARN for use with Resource Access Manager (RAM).</p>
+   */
+  S3OutpostArn?: string;
+
   /**
    * @public
    * <p>Specifies the unique identifier for the outpost.</p>
diff --git a/codegen/sdk-codegen/aws-models/s3outposts.json b/codegen/sdk-codegen/aws-models/s3outposts.json
index cea5fd2d30f0..a948eb0ab638 100644
--- a/codegen/sdk-codegen/aws-models/s3outposts.json
+++ b/codegen/sdk-codegen/aws-models/s3outposts.json
@@ -733,6 +733,12 @@
             "smithy.api#documentation": "<p>Specifies the unique Amazon Resource Name (ARN) for the outpost.</p>"
           }
         },
+        "S3OutpostArn": {
+          "target": "com.amazonaws.s3outposts#S3OutpostArn",
+          "traits": {
+            "smithy.api#documentation": "<p>Specifies the unique S3 on Outposts ARN for use with Resource Access Manager (RAM).</p>"
+          }
+        },
         "OutpostId": {
           "target": "com.amazonaws.s3outposts#OutpostId",
           "traits": {
@@ -801,6 +807,12 @@
         "smithy.api#httpError": 404
       }
     },
+    "com.amazonaws.s3outposts#S3OutpostArn": {
+      "type": "string",
+      "traits": {
+        "smithy.api#pattern": "^arn:(aws|aws-cn|aws-us-gov|aws-iso|aws-iso-b):s3-outposts:[a-z\\-0-9]*:[0-9]{12}:outpost/(op-[a-f0-9]{17}|\\d{12})/s3$"
+      }
+    },
     "com.amazonaws.s3outposts#S3Outposts": {
       "type": "service",
       "version": "2017-07-25",