diff --git a/lib/ClassMetadata.php b/lib/ClassMetadata.php
index f441df5..ef7e5fc 100644
--- a/lib/ClassMetadata.php
+++ b/lib/ClassMetadata.php
@@ -133,4 +133,11 @@ public function getName(): string
     {
         return $this->getReflectionClass()->name;
     }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function finalize(): void
+    {
+    }
 }
diff --git a/lib/ClassMetadataInterface.php b/lib/ClassMetadataInterface.php
index d13dbb0..aee7f0f 100644
--- a/lib/ClassMetadataInterface.php
+++ b/lib/ClassMetadataInterface.php
@@ -31,4 +31,10 @@ public function getAttributesMetadata(): array;
      * @param MetadataInterface $metadata
      */
     public function addAttributeMetadata(MetadataInterface $metadata): void;
+
+    /**
+     * Called after all attributes metadata has been loaded and this metadata instance
+     * is merged with the parents.
+     */
+    // public function finalize(): void;
 }
diff --git a/lib/Factory/AbstractMetadataFactory.php b/lib/Factory/AbstractMetadataFactory.php
index e01d308..f75cebc 100644
--- a/lib/Factory/AbstractMetadataFactory.php
+++ b/lib/Factory/AbstractMetadataFactory.php
@@ -74,6 +74,10 @@ public function getMetadataFor($value): ClassMetadataInterface
         }
 
         $this->mergeSuperclasses($classMetadata);
+        if (\method_exists($classMetadata, 'finalize')) {
+            $classMetadata->finalize();
+        }
+
         $this->validate($classMetadata);
 
         $this->dispatchClassMetadataLoadedEvent($classMetadata);
diff --git a/tests/Factory/MetadataFactoryTest.php b/tests/Factory/MetadataFactoryTest.php
index 112964e..2254dcb 100644
--- a/tests/Factory/MetadataFactoryTest.php
+++ b/tests/Factory/MetadataFactoryTest.php
@@ -41,6 +41,12 @@ protected function createMetadata(\ReflectionClass $class): ClassMetadataInterfa
 
 class FakeClassMetadata extends ClassMetadata
 {
+    public $finalized = false;
+
+    public function finalize(): void
+    {
+        $this->finalized = true;
+    }
 }
 
 class FakeClassNoMetadata
@@ -242,6 +248,20 @@ public function set_metadata_class_should_create_specified_object()
         self::assertInstanceOf(FakeClassMetadata::class, $factory->getMetadataFor($this));
     }
 
+    /**
+     * @test
+     */
+    public function get_metadata_for_should_call_metadata_finalizer_method()
+    {
+        $this->loader->loadClassMetadata(Argument::type(ClassMetadataInterface::class))->willReturn(true);
+
+        $factory = new MetadataFactory($this->loader->reveal());
+        $factory->setMetadataClass(FakeClassMetadata::class);
+        $metadata = $factory->getMetadataFor($this);
+
+        self::assertTrue($metadata->finalized);
+    }
+
     /**
      * @test
      */