diff --git a/docs/reference/form_types.rst b/docs/reference/form_types.rst
index 5c3be0d4..42e83095 100644
--- a/docs/reference/form_types.rst
+++ b/docs/reference/form_types.rst
@@ -237,17 +237,7 @@ They will allow you to have a JS date picker onto your form fields as follows:
 
 .. image:: ../images/datepicker.png
 
-In order to use them, you'll need to perform a bit of setup:
-
-.. code-block:: yaml
-
-    # config/packages/twig.yaml
-
-    twig:
-        form_themes:
-            - '@SonataForm/Form/datepicker.html.twig'
-
-Finally, in your form, you may use the form type as follows::
+In your form, you may use the form type as follows::
 
     // src/Admin/PageAdmin.php
 
diff --git a/src/Bridge/Symfony/DependencyInjection/SonataFormExtension.php b/src/Bridge/Symfony/DependencyInjection/SonataFormExtension.php
index 96b1b086..f5cdd780 100644
--- a/src/Bridge/Symfony/DependencyInjection/SonataFormExtension.php
+++ b/src/Bridge/Symfony/DependencyInjection/SonataFormExtension.php
@@ -37,6 +37,13 @@ public function prepend(ContainerBuilder $container): void
                 );
             }
         }
+
+        // add custom form widgets
+        if ($container->hasExtension('twig')) {
+            $container->prependExtensionConfig('twig', [
+                'form_themes' => ['@SonataForm/Form/datepicker.html.twig'],
+            ]);
+        }
     }
 
     public function load(array $configs, ContainerBuilder $container): void