diff --git a/.config/s3.config.php b/.config/s3.config.php
index 9941c562..20f4d8dd 100644
--- a/.config/s3.config.php
+++ b/.config/s3.config.php
@@ -19,7 +19,14 @@ if (getenv('OBJECTSTORE_S3_BUCKET')) {
         // required for some non Amazon S3 implementations
         'use_path_style' => $use_path == true && strtolower($use_path) !== 'false',
         // required for older protocol versions
-        'legacy_auth' => $use_legacyauth == true && strtolower($use_legacyauth) !== 'false'
+        'legacy_auth' => $use_legacyauth == true && strtolower($use_legacyauth) !== 'false',
+        'concurrency' => getenv('OBJECTSTORE_S3_CONCURRENCY') ?: 5,
+        'proxy' => getenv('OBJECTSTORE_S3_PROXY') ?: false,
+        'timeout' => getenv('OBJECTSTORE_S3_TIMEOUT') ?: 15,
+        'uploadPartSize' => getenv('OBJECTSTORE_S3_UPLOADPARTSIZE') ?: 524288000,
+        'putSizeLimit' => getenv('OBJECTSTORE_S3_PUTSIZELIMIT') ?: 104857600,
+        'version' => getenv('OBJECTSTORE_S3_VERSION') ?: "latest",
+        'verify_bucket_exists' => getenv('OBJECTSTORE_S3_VERIFY_BUCKET_EXISTS') ?: true
       )
     )
   );
diff --git a/README.md b/README.md
index b9f7a66d..cc98d340 100644
--- a/README.md
+++ b/README.md
@@ -192,6 +192,13 @@ To use an external S3 compatible object store as primary storage, set the follow
 - `OBJECTSTORE_S3_OBJECT_PREFIX` (default: `urn:oid:`): Prefix to prepend to the fileid
 - `OBJECTSTORE_S3_AUTOCREATE` (default: `true`): Create the container if it does not exist
 - `OBJECTSTORE_S3_SSE_C_KEY` (not set by default): Base64 encoded key with a maximum length of 32 bytes for server side encryption (SSE-C)
+- `OBJECTSTORE_S3_CONCURRENCY` (default: `5`) defines the maximum number of concurrent multipart uploads
+- `OBJECTSTORE_S3_PROXY` (default: `false`)
+- `OBJECTSTORE_S3_TIMEOUT` (default: `15`)
+- `OBJECTSTORE_S3_UPLOADPARTSIZE` (default: `524288000`)
+- `OBJECTSTORE_S3_PUTSIZELIMIT` (default: `104857600`)
+- `OBJECTSTORE_S3_VERSION` (default: `latest`)
+- `OBJECTSTORE_S3_VERIFY_BUCKET_EXISTS` (default: `true`)
 
 Check the [Nextcloud documentation](https://docs.nextcloud.com/server/latest/admin_manual/configuration_files/primary_storage.html#simple-storage-service-s3) for more information.