diff --git a/UPGRADE-3.1.md b/UPGRADE-3.1.md
index 8d8eea498f121..e4844dd62077c 100644
--- a/UPGRADE-3.1.md
+++ b/UPGRADE-3.1.md
@@ -45,6 +45,7 @@ Yaml
 
    ```php
    Yaml::dump(array('foo' => new A(), 'bar' => 1), 0, 0, false, Yaml::DUMP_OBJECT);
+   ```
 
  * The `!!php/object` tag to indicate dumped PHP objects has been deprecated
    and will be removed in Symfony 4.0. Use the `!php/object` tag instead.