S3 access_key_id & secret_access_key args

content/docs/command-reference/remote/modify.md

@@ -108,6 +108,20 @@ these settings, you could use the following options:
   $ dvc remote modify myremote endpointurl https://myendpoint.com
   ```
 
+- `access_key_id` - AWS Access Key ID. Optional, overrides credentials from
+  `credentialpath`:
+
+  ```dvc
+  $ dvc remote modify myremote access_key_id my-access-key-id
+  ```
+
+- `secret_access_key` - AWS Secret Access Key. Optional, Overrides credentials
+  from `credentialpath`:
+
+  ```dvc
+  $ dvc remote modify myremote secret_access_key my-secret_access_key
+  ```
+
 - `url` - remote location URL
 
   ```dvc