diff --git a/clients/client-s3/src/endpoint/EndpointParameters.ts b/clients/client-s3/src/endpoint/EndpointParameters.ts
index 73589d530a0b0..0cf8194a04040 100644
--- a/clients/client-s3/src/endpoint/EndpointParameters.ts
+++ b/clients/client-s3/src/endpoint/EndpointParameters.ts
@@ -5,6 +5,9 @@ import type { Endpoint, EndpointParameters as __EndpointParameters, EndpointV2,
  * @public
  */
 export interface ClientInputEndpointParameters {
+  clientContextParams?: {
+    disableS3ExpressSessionAuth?: boolean | undefined | Provider<boolean | undefined>;
+  };
   region?: string | undefined | Provider<string | undefined>;
   useFipsEndpoint?: boolean | undefined | Provider<boolean | undefined>;
   useDualstackEndpoint?: boolean | undefined | Provider<boolean | undefined>;
@@ -38,6 +41,7 @@ export const resolveClientEndpointParameters = <T>(
     useGlobalEndpoint: options.useGlobalEndpoint ?? false,
     disableMultiregionAccessPoints: options.disableMultiregionAccessPoints ?? false,
     defaultSigningName: "s3",
+    clientContextParams: options.clientContextParams ?? {},
   });
 };
 
diff --git a/private/aws-client-api-test/src/client-interface-tests/client-s3/impl/initializeWithMaximalConfiguration.ts b/private/aws-client-api-test/src/client-interface-tests/client-s3/impl/initializeWithMaximalConfiguration.ts
index 48915588f4c43..8cf134a6dc4b0 100644
--- a/private/aws-client-api-test/src/client-interface-tests/client-s3/impl/initializeWithMaximalConfiguration.ts
+++ b/private/aws-client-api-test/src/client-interface-tests/client-s3/impl/initializeWithMaximalConfiguration.ts
@@ -138,6 +138,7 @@ export const initializeWithMaximalConfiguration = () => {
     responseChecksumValidation: DEFAULT_RESPONSE_CHECKSUM_VALIDATION,
     requestStreamBufferSize: 8 * 1024,
     expectContinueHeader: 8 * 1024 * 1024,
+    clientContextParams: {},
   };
 
   const s3 = new S3Client(config);