diff --git a/DependencyInjection/NelmioApiDocExtension.php b/DependencyInjection/NelmioApiDocExtension.php
index 01fc733..1f303f0 100644
--- a/DependencyInjection/NelmioApiDocExtension.php
+++ b/DependencyInjection/NelmioApiDocExtension.php
@@ -131,6 +131,7 @@ final class NelmioApiDocExtension extends Extension implements PrependExtensionI
                     new Reference('jms_serializer.metadata_factory'),
                     new Reference('jms_serializer.naming_strategy'),
                     new Reference('nelmio_api_doc.model_describers.swagger_property_annotation_reader'),
+                    new Reference('nelmio_api_doc.model_describers.swagger_definition_annotation_reader'),
                     new Reference('nelmio_api_doc.model_describers.phpdoc_property_annotation_reader'),
                 ])
                 ->addTag('nelmio_api_doc.model_describer', ['priority' => 50]);
diff --git a/ModelDescriber/JMSModelDescriber.php b/ModelDescriber/JMSModelDescriber.php
index d7d13e7..45f5915 100644
--- a/ModelDescriber/JMSModelDescriber.php
+++ b/ModelDescriber/JMSModelDescriber.php
@@ -35,17 +35,21 @@ class JMSModelDescriber implements ModelDescriberInterface, ModelRegistryAwareIn
 
     private $swaggerPropertyAnnotationReader;
 
+    private $swaggerDefinitionAnnotationReader;
+
     private $phpdocPropertyAnnotationsReader;
 
     public function __construct(
         MetadataFactoryInterface $factory,
         PropertyNamingStrategyInterface $namingStrategy,
         SwaggerPropertyAnnotationReader $swaggerPropertyAnnotationReader,
+        SwaggerDefinitionAnnotationReader $swaggerDefinitionAnnotationReader,
         PhpdocPropertyAnnotationReader $phpdocPropertyAnnotationReader = null
     ) {
         $this->factory = $factory;
         $this->namingStrategy = $namingStrategy;
         $this->swaggerPropertyAnnotationReader = $swaggerPropertyAnnotationReader;
+        $this->swaggerDefinitionAnnotationReader = $swaggerDefinitionAnnotationReader;
         $this->phpdocPropertyAnnotationsReader = $phpdocPropertyAnnotationReader;
     }
 
@@ -63,6 +67,7 @@ class JMSModelDescriber implements ModelDescriberInterface, ModelRegistryAwareIn
         $groupsExclusion = null !== $model->getGroups() ? new GroupsExclusionStrategy($model->getGroups()) : null;
 
         $schema->setType('object');
+        $this->swaggerDefinitionAnnotationReader->updateWithSwaggerDefinitionAnnotation(new \ReflectionClass($className), $schema);
         $properties = $schema->getProperties();
         foreach ($metadata->propertyMetadata as $item) {
             // filter groups
diff --git a/ModelDescriber/ObjectModelDescriber.php b/ModelDescriber/ObjectModelDescriber.php
index ee58483..1dea437 100644
--- a/ModelDescriber/ObjectModelDescriber.php
+++ b/ModelDescriber/ObjectModelDescriber.php
@@ -26,12 +26,16 @@ class ObjectModelDescriber implements ModelDescriberInterface, ModelRegistryAwar
 
     private $swaggerPropertyAnnotationReader;
 
+    private $swaggerDefinitionAnnotationReader;
+
     public function __construct(
         PropertyInfoExtractorInterface $propertyInfo,
-        SwaggerPropertyAnnotationReader $swaggerPropertyAnnotationReader
+        SwaggerPropertyAnnotationReader $swaggerPropertyAnnotationReader,
+        SwaggerDefinitionAnnotationReader $swaggerDefinitionAnnotationReader
     ) {
         $this->propertyInfo = $propertyInfo;
         $this->swaggerPropertyAnnotationReader = $swaggerPropertyAnnotationReader;
+        $this->swaggerDefinitionAnnotationReader = $swaggerDefinitionAnnotationReader;
     }
 
     public function describe(Model $model, Schema $schema)
@@ -44,6 +48,7 @@ class ObjectModelDescriber implements ModelDescriberInterface, ModelRegistryAwar
         if (null !== $model->getGroups()) {
             $context = ['serializer_groups' => $model->getGroups()];
         }
+        $this->swaggerDefinitionAnnotationReader->updateWithSwaggerDefinitionAnnotation(new \ReflectionClass($class), $schema);
 
         $propertyInfoProperties = $this->propertyInfo->getProperties($class, $context);
         if (null === $propertyInfoProperties) {
diff --git a/ModelDescriber/SwaggerDefinitionAnnotationReader.php b/ModelDescriber/SwaggerDefinitionAnnotationReader.php
new file mode 100644
index 0000000..848a638
--- /dev/null
+++ b/ModelDescriber/SwaggerDefinitionAnnotationReader.php
@@ -0,0 +1,41 @@
+<?php
+
+/*
+ * This file is part of the NelmioApiDocBundle package.
+ *
+ * (c) Nelmio
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Nelmio\ApiDocBundle\ModelDescriber;
+
+use Doctrine\Common\Annotations\Reader;
+use EXSyst\Component\Swagger\Schema;
+use Swagger\Annotations\Definition as SwgDefinition;
+
+/**
+ * @internal
+ */
+class SwaggerDefinitionAnnotationReader
+{
+    private $annotationsReader;
+
+    public function __construct(Reader $annotationsReader)
+    {
+        $this->annotationsReader = $annotationsReader;
+    }
+
+    public function updateWithSwaggerDefinitionAnnotation(\ReflectionClass $reflectionClass, Schema $schema)
+    {
+        /** @var SwgDefinition $swgDefinition */
+        if (!$swgDefinition = $this->annotationsReader->getClassAnnotation($reflectionClass, SwgDefinition::class)) {
+            return;
+        }
+
+        if (null !== $swgDefinition->required) {
+            $schema->setRequired($swgDefinition->required);
+        }
+    }
+}
diff --git a/ModelDescriber/SwaggerPropertyAnnotationReader.php b/ModelDescriber/SwaggerPropertyAnnotationReader.php
index f6f5381..79492c8 100644
--- a/ModelDescriber/SwaggerPropertyAnnotationReader.php
+++ b/ModelDescriber/SwaggerPropertyAnnotationReader.php
@@ -14,7 +14,6 @@ namespace Nelmio\ApiDocBundle\ModelDescriber;
 use Doctrine\Common\Annotations\Reader;
 use EXSyst\Component\Swagger\Schema;
 use Swagger\Annotations\Property as SwgProperty;
-use const Swagger\Annotations\UNDEFINED;
 
 /**
  * @internal
@@ -30,31 +29,15 @@ class SwaggerPropertyAnnotationReader
 
     public function updateWithSwaggerPropertyAnnotation(\ReflectionProperty $reflectionProperty, Schema $property)
     {
+        /** @var SwgProperty $swgProperty */
         if (!$swgProperty = $this->annotationsReader->getPropertyAnnotation($reflectionProperty, SwgProperty::class)) {
             return;
         }
 
-        if (null !== $swgProperty->type) {
-            $property->setType($swgProperty->type);
-        }
-        if (UNDEFINED !== $swgProperty->default) {
-            $property->setDefault($swgProperty->default);
-        }
-        if (null !== $swgProperty->enum) {
-            $property->setEnum($swgProperty->enum);
+        if (!$swgProperty->validate()) {
+            return;
         }
 
-        if (null !== $swgProperty->description) {
-            $property->setDescription($swgProperty->description);
-        }
-        if (null !== $swgProperty->title) {
-            $property->setTitle($swgProperty->title);
-        }
-        if (null !== $swgProperty->example) {
-            $property->setExample($swgProperty->example);
-        }
-        if (null !== $swgProperty->readOnly) {
-            $property->setReadOnly($swgProperty->readOnly);
-        }
+        $property->merge(\json_decode(\json_encode($swgProperty)));
     }
 }
diff --git a/Resources/config/services.xml b/Resources/config/services.xml
index 117cf2d..97def1b 100644
--- a/Resources/config/services.xml
+++ b/Resources/config/services.xml
@@ -43,6 +43,10 @@
             <argument type="service" id="annotation_reader" />
         </service>
 
+        <service id="nelmio_api_doc.model_describers.swagger_definition_annotation_reader" class="Nelmio\ApiDocBundle\ModelDescriber\SwaggerDefinitionAnnotationReader" public="false">
+            <argument type="service" id="annotation_reader" />
+        </service>
+
         <service
                 id="nelmio_api_doc.model_describers.phpdoc_property_annotation_reader"
                 class="Nelmio\ApiDocBundle\ModelDescriber\PhpdocPropertyAnnotationReader"
@@ -52,6 +56,7 @@
         <service id="nelmio_api_doc.model_describers.object" class="Nelmio\ApiDocBundle\ModelDescriber\ObjectModelDescriber" public="false">
             <argument type="service" id="property_info" />
             <argument type="service" id="nelmio_api_doc.model_describers.swagger_property_annotation_reader" />
+            <argument type="service" id="nelmio_api_doc.model_describers.swagger_definition_annotation_reader" />
 
             <tag name="nelmio_api_doc.model_describer" />
         </service>
diff --git a/Tests/Functional/Entity/JMSComplex.php b/Tests/Functional/Entity/JMSComplex.php
index 9f308e4..a2d964d 100644
--- a/Tests/Functional/Entity/JMSComplex.php
+++ b/Tests/Functional/Entity/JMSComplex.php
@@ -12,9 +12,11 @@
 namespace Nelmio\ApiDocBundle\Tests\Functional\Entity;
 
 use JMS\Serializer\Annotation as Serializer;
+use Swagger\Annotations as SWG;
 
 /**
  * @Serializer\ExclusionPolicy("all")
+ * @SWG\Definition(required={"id", "user"})
  */
 class JMSComplex
 {
diff --git a/Tests/Functional/Entity/JMSUser.php b/Tests/Functional/Entity/JMSUser.php
index 07eb4fd..7a7dc7e 100644
--- a/Tests/Functional/Entity/JMSUser.php
+++ b/Tests/Functional/Entity/JMSUser.php
@@ -26,7 +26,7 @@ class JMSUser
      * @Serializer\Expose
      * @Serializer\Groups({"list"})
      *
-     * @SWG\Property(description = "User id", required = true, readOnly = true, title = "userid", example=1, default = null)
+     * @SWG\Property(description = "User id", readOnly = true, title = "userid", example=1, default = null)
      */
     private $id;
 
@@ -35,7 +35,7 @@ class JMSUser
      * @Serializer\Expose
      * @Serializer\SerializedName("daysOnline")
      *
-     * @SWG\Property(default = 0)
+     * @SWG\Property(default = 0, minimum = 1, maximum = 300)
      */
     private $daysOnline;
 
@@ -85,7 +85,7 @@ class JMSUser
      * @Serializer\Expose
      * @Serializer\SerializedName("friendsNumber")
      *
-     * @SWG\Property(type = "string")
+     * @SWG\Property(type = "string", minLength = 1, maxLength = 100)
      */
     private $friendsNumber;
 
diff --git a/Tests/Functional/Entity/User.php b/Tests/Functional/Entity/User.php
index cf14a3e..8529ec2 100644
--- a/Tests/Functional/Entity/User.php
+++ b/Tests/Functional/Entity/User.php
@@ -21,7 +21,7 @@ class User
     /**
      * @var int
      *
-     * @SWG\Property(description = "User id", required = true, readOnly = true, title = "userid", example=1, default = null)
+     * @SWG\Property(description = "User id", readOnly = true, title = "userid", example=1, default = null)
      */
     private $id;
 
@@ -35,7 +35,6 @@ class User
      *
      * @SWG\Property(
      *     description = "User roles",
-     *     required = true,
      *     title = "roles",
      *     example="[""ADMIN"",""SUPERUSER""]",
      *     default = {"user"},
diff --git a/Tests/Functional/JMSFunctionalTest.php b/Tests/Functional/JMSFunctionalTest.php
index e77a78f..9304a78 100644
--- a/Tests/Functional/JMSFunctionalTest.php
+++ b/Tests/Functional/JMSFunctionalTest.php
@@ -28,6 +28,8 @@ class JMSFunctionalTest extends WebTestCase
                 'daysOnline' => [
                     'type' => 'integer',
                     'default' => 0,
+                    'minimum' => 1,
+                    'maximum' => 300,
                 ],
                 'email' => [
                     'type' => 'string',
@@ -43,6 +45,8 @@ class JMSFunctionalTest extends WebTestCase
                 ],
                 'friendsNumber' => [
                     'type' => 'string',
+                    'maxLength' => 100,
+                    'minLength' => 1,
                 ],
                 'friends' => [
                     'type' => 'array',
@@ -75,6 +79,10 @@ class JMSFunctionalTest extends WebTestCase
                 'user' => ['$ref' => '#/definitions/JMSUser2'],
                 'name' => ['type' => 'string'],
             ],
+            'required' => [
+                'id',
+                'user',
+            ],
         ], $this->getModel('JMSComplex')->toArray());
 
         $this->assertEquals([