diff --git a/README.md b/README.md
index 8b054ca..aa2740f 100644
--- a/README.md
+++ b/README.md
@@ -37,6 +37,18 @@ const client = addProxyToClient(new S3Client({}));
 // `client` now has HTTP proxy config at 'http://127.0.0.1'
 ```
 
+or
+
+```ts
+import { S3Client } from '@aws-sdk/client-s3';
+import { addProxyToClient } from 'aws-sdk-v3-proxy';
+
+const client = addProxyToClient(new S3Client({}), {
+  httpProxy: 'http://127.0.0.1',
+});
+// `client` now has HTTP proxy config at 'http://127.0.0.1'
+```
+
 ### HTTPS Proxy
 
 ```ts
@@ -48,6 +60,18 @@ const client = addProxyToClient(new S3Client({}));
 // `client` now has HTTPS proxy config at 'https://127.0.0.1'
 ```
 
+or
+
+```ts
+import { S3Client } from '@aws-sdk/client-s3';
+import { addProxyToClient } from 'aws-sdk-v3-proxy';
+
+const client = addProxyToClient(new S3Client({}), {
+  httpsProxy: 'https://127.0.0.1',
+});
+// `client` now has HTTPS proxy config at 'https://127.0.0.1'
+```
+
 ### No Proxy with exception disabled
 
 ```ts
@@ -112,6 +136,18 @@ Default: `false`
 
 Toggles additional logging for debugging.
 
+##### httpProxy
+
+Type: `string`
+
+The URL for the HTTP proxy server.
+If not specified, the value of `process.env.http_proxy` or `process.env.HTTP_RPOXY` will be used.
+
+##### httpsProxy
+
+The URL for the HTTPS proxy server.
+If not specified, the value of `process.env.https_proxy` or `process.env.HTTPS_RPOXY` will be used.
+
 ##### agentOptions
 
 Type: `HttpsProxyAgentOptions`
@@ -126,17 +162,17 @@ See [CONTRIBUTING](CONTRIBUTING.md#security-issue-notifications) for more inform
 
 This project is licensed under the Apache-2.0 License.
 
-[build-img]:https://github.com/awslabs/aws-sdk-v3-js-proxy/actions/workflows/release.yml/badge.svg
-[build-url]:https://github.com/awslabs/aws-sdk-v3-js-proxy/actions/workflows/release.yml
-[downloads-img]:https://img.shields.io/npm/dt/aws-sdk-v3-proxy
-[downloads-url]:https://www.npmtrends.com/aws-sdk-v3-proxy
-[npm-img]:https://img.shields.io/npm/v/aws-sdk-v3-proxy
-[npm-url]:https://www.npmjs.com/package/aws-sdk-v3-proxy
-[issues-img]:https://img.shields.io/github/issues/awslabs/aws-sdk-v3-js-proxy
-[issues-url]:https://github.com/awslabs/aws-sdk-v3-js-proxy/issues
-[codecov-img]:https://codecov.io/gh/awslabs/aws-sdk-v3-js-proxy/branch/main/graph/badge.svg
-[codecov-url]:https://codecov.io/gh/awslabs/aws-sdk-v3-js-proxy
-[semantic-release-img]:https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--release-e10079.svg
-[semantic-release-url]:https://github.com/semantic-release/semantic-release
-[commitizen-img]:https://img.shields.io/badge/commitizen-friendly-brightgreen.svg
-[commitizen-url]:http://commitizen.github.io/cz-cli/
+[build-img]: https://github.com/awslabs/aws-sdk-v3-js-proxy/actions/workflows/release.yml/badge.svg
+[build-url]: https://github.com/awslabs/aws-sdk-v3-js-proxy/actions/workflows/release.yml
+[downloads-img]: https://img.shields.io/npm/dt/aws-sdk-v3-proxy
+[downloads-url]: https://www.npmtrends.com/aws-sdk-v3-proxy
+[npm-img]: https://img.shields.io/npm/v/aws-sdk-v3-proxy
+[npm-url]: https://www.npmjs.com/package/aws-sdk-v3-proxy
+[issues-img]: https://img.shields.io/github/issues/awslabs/aws-sdk-v3-js-proxy
+[issues-url]: https://github.com/awslabs/aws-sdk-v3-js-proxy/issues
+[codecov-img]: https://codecov.io/gh/awslabs/aws-sdk-v3-js-proxy/branch/main/graph/badge.svg
+[codecov-url]: https://codecov.io/gh/awslabs/aws-sdk-v3-js-proxy
+[semantic-release-img]: https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--release-e10079.svg
+[semantic-release-url]: https://github.com/semantic-release/semantic-release
+[commitizen-img]: https://img.shields.io/badge/commitizen-friendly-brightgreen.svg
+[commitizen-url]: http://commitizen.github.io/cz-cli/
diff --git a/src/add-proxy.ts b/src/add-proxy.ts
index 6e0a6cb..b7071e2 100644
--- a/src/add-proxy.ts
+++ b/src/add-proxy.ts
@@ -15,11 +15,11 @@ export const addProxyToClient = <T>(
     httpsOnly = false,
     throwOnNoProxy = true,
     agentOptions = {},
+    httpProxy = getHttpProxy(),
+    httpsProxy = getHttpsProxy(),
     ...opts
   }: AddProxyOptions = {}
 ): T => {
-  const httpProxy = getHttpProxy();
-  const httpsProxy = getHttpsProxy();
   const httpAgent = httpProxy
     ? new HttpsProxyAgent({ proxy: httpProxy, ...agentOptions })
     : undefined;
diff --git a/src/types.ts b/src/types.ts
index b6d49de..94cb946 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -37,6 +37,16 @@ export interface AddProxyOptions
    * @default false
    */
   httpsOnly?: boolean;
+  /**
+   * The URL for the HTTP proxy server.
+   * If not specified, the value of `process.env.http_proxy` or `process.env.HTTP_RPOXY` will be used.
+   */
+  httpProxy?: string;
+  /**
+   * The URL for the HTTPS proxy server.
+   * If not specified, the value of `process.env.https_proxy` or `process.env.HTTPS_RPOXY` will be used.
+   */
+  httpsProxy?: string;
   /**
    * Options to be provided to the proxy agent. This can be used for modifyi
    */
diff --git a/test/add-proxy.spec.ts b/test/add-proxy.spec.ts
index df53939..9ee67aa 100644
--- a/test/add-proxy.spec.ts
+++ b/test/add-proxy.spec.ts
@@ -186,5 +186,21 @@ describe('add-proxy', () => {
         expect.objectContaining(opts)
       );
     });
+
+    it('should attach an httpAgent AND httpsAgent when both proxies are set by options', () => {
+      const opts: AddProxyOptions = {
+        httpProxy: 'http://localhost',
+        httpsProxy: 'https://localhost',
+      };
+
+      addProxyToClient(client, opts);
+
+      expect(proxyAgentSpy).toHaveBeenNthCalledWith(1, {
+        proxy: 'http://localhost',
+      });
+      expect(proxyAgentSpy).toHaveBeenNthCalledWith(2, {
+        proxy: 'https://localhost',
+      });
+    });
   });
 });