diff --git a/UPGRADE-2.1.md b/UPGRADE-2.1.md
index c8faf03578..dad88e9117 100644
--- a/UPGRADE-2.1.md
+++ b/UPGRADE-2.1.md
@@ -559,6 +559,17 @@
     ));
     ```
 
+    Unlike previously, you can also pass a list of constraints now:
+
+    ```
+    $builder->add('name', 'text', array(
+        'constraints' => array(
+            new NotBlank(),
+            new MinLength(3),
+        ),
+    ));
+    ```
+
 ### Validator
 
   * The methods `setMessage()`, `getMessageTemplate()` and