diff --git a/DependencyInjection/Configuration.php b/DependencyInjection/Configuration.php
index 71a52d9..129702d 100644
--- a/DependencyInjection/Configuration.php
+++ b/DependencyInjection/Configuration.php
@@ -19,8 +19,8 @@ class Configuration implements ConfigurationInterface
      */
     public function getConfigTreeBuilder(): TreeBuilder
     {
-        $treeBuilder = new TreeBuilder();
-        $rootNode = $treeBuilder->root('ltree_extension');
+        $treeBuilder = new TreeBuilder('ltree_extension');
+        $rootNode = $treeBuilder->getRootNode();
 
         // Here you should define the parameters that are allowed to
         // configure your bundle. See the documentation linked above for
diff --git a/README.md b/README.md
index c9fc462..03ed9f0 100644
--- a/README.md
+++ b/README.md
@@ -94,3 +94,25 @@ class TestRepository extends LTreeEntityRepository
 }
 ```
 
+3. Create Extension via migration
+```php
+    public function up(Schema $schema) : void
+    {
+        $this->addSql('CREATE IF NOT EXISTS EXTENSION ltree');
+    }
+    ...
+```
+
+4. Configure Doctrine Type via config (packages/doctrine.yaml):
+```yaml
+doctrine:
+    dbal:
+        url: '%env(resolve:DATABASE_URL)%'
+        types:
+            ltree:  LTree\Types\LTreeType
+```
+
+5. Configure Bundle via config (bundles.php):
+```php
+LTree\LTreeExtensionBundle::class => ['all' => true],
+```
diff --git a/Repository/LTreeChildrenInterface.php b/Repository/LTreeChildrenInterface.php
index 9c9b5dd..e07330b 100644
--- a/Repository/LTreeChildrenInterface.php
+++ b/Repository/LTreeChildrenInterface.php
@@ -11,19 +11,19 @@
 interface LTreeChildrenInterface
 {
     /**
-     * @param object|LTreeEntityInterface $children
+     * @param object|LTreeEntityInterface|LTreeChildrenInterface $children
      * @return object
      */
     public function addChildren($children);
 
     /**
-     * @param object|LTreeEntityInterface $children
+     * @param object|LTreeEntityInterface|LTreeChildrenInterface $children
      * @return object
      */
     public function removeChildren($children);
 
     /**
-     * @return ArrayCollection|object[]|LTreeEntityInterface[]
+     * @return ArrayCollection|object[]|LTreeEntityInterface[]|LTreeChildrenInterface[]
      */
     public function getChildren();
 }
diff --git a/Repository/LTreeParentInterface.php b/Repository/LTreeParentInterface.php
index 58f6f55..112d3c9 100644
--- a/Repository/LTreeParentInterface.php
+++ b/Repository/LTreeParentInterface.php
@@ -9,13 +9,13 @@
 interface LTreeParentInterface
 {
     /**
-     * @param object|null|LTreeEntityInterface $parent
+     * @param object|null|LTreeEntityInterface|LTreeParentInterface $parent
      * @return object
      */
     public function setParent($parent);
 
     /**
-     * @return object|null|LTreeEntityInterface
+     * @return object|null|LTreeEntityInterface|LTreeParentInterface
      */
     public function getParent();
 }
diff --git a/Repository/LTreePathInterface.php b/Repository/LTreePathInterface.php
index 21ffe76..624cb76 100644
--- a/Repository/LTreePathInterface.php
+++ b/Repository/LTreePathInterface.php
@@ -15,7 +15,7 @@ public function getPath(): array;
 
     /**
      * @param array|null $path
-     * @return LTreeEntityInterface
+     * @return LTreeEntityInterface|LTreePathInterface
      */
     public function setPath(?array $path);
 
diff --git a/composer.json b/composer.json
index 64bb3a8..0b2c24c 100644
--- a/composer.json
+++ b/composer.json
@@ -4,7 +4,7 @@
   "type" : "symfony-bundle",
   "homepage": "https://github.com/pvsaintpe/ltree-bundle",
   "license" : "MIT",
-  "keywords" : ["ltree", "postgresql", "symfony", "symfony4", "php73", "php", "nested"],
+  "keywords" : ["ltree", "postgresql", "symfony", "symfony4", "symfony5", "php8", "php", "nested"],
   "authors" : [
       {
         "name" : "Veselov Pavel",
@@ -12,9 +12,9 @@
       }
   ],
   "require" : {
-    "php": "^7.1.3",
-    "symfony/orm-pack": "^1.0",
-    "symfony/property-access": "4.2.*"
+    "php": "^7.4|^8.0",
+    "symfony/orm-pack": "^1.0|^2.0",
+    "symfony/property-access": "^4.2|^5.0"
   },
   "autoload" : {
     "psr-4" : {
@@ -28,7 +28,7 @@
     "symfony": {
       "id": "",
       "allow-contrib": false,
-      "require": "4.2.*"
+      "require": "^4.3|^5.0"
     }
   }
 }