diff --git a/Formatter/AbstractFormatter.php b/Formatter/AbstractFormatter.php
index bb05506..a6f9199 100644
--- a/Formatter/AbstractFormatter.php
+++ b/Formatter/AbstractFormatter.php
@@ -120,7 +120,7 @@ abstract class AbstractFormatter implements FormatterInterface
         $data['requirements'] = $requirements;
 
         if (null !== $formType = $apiDoc->getFormType()) {
-            $data['parameters'] = $this->parser->parse(new $formType());
+            $data['parameters'] = $this->parser->parse($formType);
 
             if ('PUT' === $method) {
                 // All parameters are optional with PUT (update)
diff --git a/Parser/FormTypeParser.php b/Parser/FormTypeParser.php
index c59c3d0..b19de40 100644
--- a/Parser/FormTypeParser.php
+++ b/Parser/FormTypeParser.php
@@ -11,7 +11,6 @@
 
 namespace Nelmio\ApiDocBundle\Parser;
 
-use Symfony\Component\Form\AbstractType;
 use Symfony\Component\Form\FormBuilder;
 use Symfony\Component\Form\FormFactoryInterface;
 
@@ -47,11 +46,14 @@ class FormTypeParser
      *  - required
      *  - description
      *
-     * @param  AbstractType $type
+     * @param  string|\Symfony\Component\Form\FormTypeInterface $type
      * @return array
      */
-    public function parse(AbstractType $type)
+    public function parse($type)
     {
+        if (is_string($type) && class_exists($type)) {
+            $type = new $type();
+        }
         $form = $this->formFactory->create($type);
 
         $parameters = array();
diff --git a/README.md b/README.md
index 365fb87..351471a 100644
--- a/README.md
+++ b/README.md
@@ -95,7 +95,8 @@ The following properties are available:
 
 * `filters`: an array of filters;
 
-* `formType`: the Form Type associated to the method, useful for POST|PUT methods.
+* `formType`: the Form Type associated to the method, useful for POST|PUT methods, either as FQCN or
+  as form type (if it is registered in the form factory in the container)
 
 Each _filter_ has to define a `name` parameter, but other parameters are free. Filters are often optional
 parameters, and you can document them as you want, but keep in mind to be consistent for the whole documentation.