diff --git a/docs/crud-controllers.md b/docs/crud-controllers.md
index 518c606..492a8ff 100644
--- a/docs/crud-controllers.md
+++ b/docs/crud-controllers.md
@@ -1,6 +1,9 @@
 About CRUD Controllers
 ======================
 
+⚠️ By default Melodiia provides a doctrine integration. But if you didn't install Doctrine, it will not register
+CRUD controllers. Be sure Doctrine is installed.
+
 Here are all the controllers for your CRUD.
 
 | CRUD action       | Service name                     |
diff --git a/docs/getting-started.md b/docs/getting-started.md
index 6a73a17..8a9b3a9 100644
--- a/docs/getting-started.md
+++ b/docs/getting-started.md
@@ -125,6 +125,8 @@ documentation:
         documentation_file_path: '%kernel.project_dir%/config/documentation.yaml'
 ```
 
+⚠️ The render of the documentation cannot work without Twig. Be sure twig is installed.
+
 Step 5: do what you want
 ------------------------
 
diff --git a/src/DependencyInjection/MelodiiaExtension.php b/src/DependencyInjection/MelodiiaExtension.php
index 39bda9b..332dc05 100644
--- a/src/DependencyInjection/MelodiiaExtension.php
+++ b/src/DependencyInjection/MelodiiaExtension.php
@@ -4,6 +4,7 @@
 
 namespace SwagIndustries\Melodiia\DependencyInjection;
 
+use Doctrine\Persistence\AbstractManagerRegistry;
 use SwagIndustries\Melodiia\Crud\FilterInterface;
 use SwagIndustries\Melodiia\Serialization\Context\ContextBuilderInterface;
 use Symfony\Component\Config\FileLocator;
@@ -11,6 +12,7 @@
 use Symfony\Component\DependencyInjection\Extension\Extension;
 use Symfony\Component\DependencyInjection\Loader\XmlFileLoader;
 use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
+use Twig\Environment;
 
 class MelodiiaExtension extends Extension
 {
@@ -25,6 +27,16 @@ public function load(array $configs, ContainerBuilder $container)
         $xmlLoader = new XmlFileLoader($container, $configFileLocator);
         $xmlLoader->load('error-management.xml');
 
+        if (class_exists(AbstractManagerRegistry::class)) {
+            $loader->load('doctrine.yaml');
+        }
+        if ($container->hasAlias('melodiia.data_provider')) {
+            $loader->load('crud.yaml');
+        }
+        if (class_exists(Environment::class)) {
+            $loader->load('twig.yaml');
+        }
+
         $configuration = new Configuration();
         $config = $this->processConfiguration($configuration, $configs);
 
diff --git a/src/Resources/config/crud.yaml b/src/Resources/config/crud.yaml
index 1d7b7b2..0c426c6 100644
--- a/src/Resources/config/crud.yaml
+++ b/src/Resources/config/crud.yaml
@@ -1,8 +1,4 @@
 services:
-    melodiia.doctrine.data_provider:
-        class: SwagIndustries\Melodiia\Doctrine\DoctrineDataStore
-        arguments:
-            $registry: '@doctrine'
 
     melodiia.crud.id_resolver:
         class: SwagIndustries\Melodiia\Crud\Tools\SimpleIdResolver
@@ -24,7 +20,7 @@ services:
     melodiia.crud.controller.create:
         class: SwagIndustries\Melodiia\Crud\Controller\Create
         arguments:
-            $dataStore: '@melodiia.doctrine.data_provider'
+            $dataStore: '@melodiia.data_provider'
             $formFactory: '@form.factory'
             $dispatcher: '@event_dispatcher'
             $checker: '@?security.authorization_checker'
@@ -33,7 +29,7 @@ services:
     melodiia.crud.controller.update:
         class: SwagIndustries\Melodiia\Crud\Controller\Update
         arguments:
-            $dataStore: '@melodiia.doctrine.data_provider'
+            $dataStore: '@melodiia.data_provider'
             $formFactory: '@form.factory'
             $dispatcher: '@event_dispatcher'
             $idResolver: '@melodiia.crud.id_resolver'
@@ -43,7 +39,7 @@ services:
     melodiia.crud.controller.get_all:
         class: SwagIndustries\Melodiia\Crud\Controller\GetAll
         arguments:
-            $dataStore: '@melodiia.doctrine.data_provider'
+            $dataStore: '@melodiia.data_provider'
             $collectionFactory: '@melodiia.crud.filters.filter_collection_factory'
             $pagesRequestFactory: '@SwagIndustries\Melodiia\Crud\Pagination\PaginationRequestFactoryInterface'
             $checker: '@?security.authorization_checker'
@@ -60,7 +56,7 @@ services:
     melodiia.crud.controller.delete:
         class: SwagIndustries\Melodiia\Crud\Controller\Delete
         arguments:
-            $dataStore: '@melodiia.doctrine.data_provider'
+            $dataStore: '@melodiia.data_provider'
             $dispatcher: '@event_dispatcher'
             $idResolver: '@melodiia.crud.id_resolver'
             $checker: '@?security.authorization_checker'
diff --git a/src/Resources/config/doctrine.yaml b/src/Resources/config/doctrine.yaml
new file mode 100644
index 0000000..5403488
--- /dev/null
+++ b/src/Resources/config/doctrine.yaml
@@ -0,0 +1,7 @@
+services:
+    melodiia.doctrine.data_provider:
+        class: SwagIndustries\Melodiia\Doctrine\DoctrineDataStore
+        arguments:
+            $registry: '@doctrine'
+
+    melodiia.data_provider: '@melodiia.doctrine.data_provider'
diff --git a/src/Resources/config/services.yaml b/src/Resources/config/services.yaml
index 8361ca6..6921ac2 100644
--- a/src/Resources/config/services.yaml
+++ b/src/Resources/config/services.yaml
@@ -1,16 +1,9 @@
 services:
-    melodiia.documentation:
-        class: SwagIndustries\Melodiia\Documentation\Controller\SwaggerUiController
-        tags: ['controller.service_arguments']
-        arguments:
-            $templating: '@twig'
-
     melodiia.configuration:
         class: SwagIndustries\Melodiia\MelodiiaConfiguration
         arguments:
             $config: '%melodiia.config%'
 
-
     # Priority -1 is DX. It allow the user to implement its own normalizers
     # that will take over those.
     melodiia.serialization.created_normalizer:
@@ -43,5 +36,4 @@ services:
             $builders: !tagged_iterator melodiia.context_builder
 
 imports:
-    - 'crud.yaml'
     - 'form.yaml'
diff --git a/src/Resources/config/twig.yaml b/src/Resources/config/twig.yaml
new file mode 100644
index 0000000..cee4019
--- /dev/null
+++ b/src/Resources/config/twig.yaml
@@ -0,0 +1,6 @@
+services:
+    melodiia.documentation:
+        class: SwagIndustries\Melodiia\Documentation\Controller\SwaggerUiController
+        tags: ['controller.service_arguments']
+        arguments:
+            $templating: '@twig'