diff --git a/Resources/public/init-swagger-ui.js b/Resources/public/init-swagger-ui.js
index 892a2b6..8fad535 100644
--- a/Resources/public/init-swagger-ui.js
+++ b/Resources/public/init-swagger-ui.js
@@ -5,9 +5,9 @@
 // For the full copyright and license information, please view the LICENSE
 // file that was distributed with this source code.
 
-window.onload = function() {
+function loadSwaggerUI(userOptions = {}) {
   const data = JSON.parse(document.getElementById('swagger-data').innerText);
-  const ui = SwaggerUIBundle({
+  const defaultOptions = {
     spec: data.spec,
     dom_id: '#swagger-ui',
     validatorUrl: null,
@@ -19,7 +19,9 @@ window.onload = function() {
       SwaggerUIBundle.plugins.DownloadUrl
     ],
     layout: 'StandaloneLayout'
-  });
+  };
+  const options = Object.assign({}, defaultOptions, userOptions);
+  const ui = SwaggerUIBundle(options);
 
   const storageKey = 'nelmio_api_auth';
 
diff --git a/Resources/views/SwaggerUi/index.html.twig b/Resources/views/SwaggerUi/index.html.twig
index ec7efa6..82e1332 100644
--- a/Resources/views/SwaggerUi/index.html.twig
+++ b/Resources/views/SwaggerUi/index.html.twig
@@ -66,8 +66,11 @@ file that was distributed with this source code. #}
         <script src="{{ asset('bundles/nelmioapidoc/swagger-ui/swagger-ui-standalone-preset.js') }}"></script>
     {% endblock javascripts %}
 
+    <script src="{{ asset('bundles/nelmioapidoc/init-swagger-ui.js') }}"></script>
     {% block swagger_initialization %}
-        <script src="{{ asset('bundles/nelmioapidoc/init-swagger-ui.js') }}"></script>
+        <script type="text/javascript">
+            window.onload = loadSwaggerUI();
+        </script>
     {% endblock swagger_initialization %}
 </body>
 </html>