diff --git a/src/Symfony/Component/Form/ResolvedFormType.php b/src/Symfony/Component/Form/ResolvedFormType.php
index 02b101d390fa4..42b0352a88129 100644
--- a/src/Symfony/Component/Form/ResolvedFormType.php
+++ b/src/Symfony/Component/Form/ResolvedFormType.php
@@ -56,9 +56,7 @@ public function __construct(FormTypeInterface $innerType, array $typeExtensions
     }
 
     /**
-     * Returns the prefix of the template block name for this type.
-     *
-     * @return string The prefix of the template block name
+     * {@inheritdoc}
      */
     public function getBlockPrefix()
     {
diff --git a/src/Symfony/Component/Form/ResolvedFormTypeInterface.php b/src/Symfony/Component/Form/ResolvedFormTypeInterface.php
index f496cdc578899..085fe41d30472 100644
--- a/src/Symfony/Component/Form/ResolvedFormTypeInterface.php
+++ b/src/Symfony/Component/Form/ResolvedFormTypeInterface.php
@@ -27,6 +27,16 @@ interface ResolvedFormTypeInterface
      */
     public function getParent();
 
+    /**
+     * Returns the prefix of the template block name for this type.
+     *
+     * The block prefix defaults to the underscored short class name with
+     * the "Type" suffix removed (e.g. "UserProfileType" => "user_profile").
+     *
+     * @return string The prefix of the template block name
+     */
+    public function getBlockPrefix();
+
     /**
      * Returns the wrapped form type.
      *