diff --git a/UPGRADE-3.1.md b/UPGRADE-3.1.md
index fffb06bad9..134dfa4e5d 100644
--- a/UPGRADE-3.1.md
+++ b/UPGRADE-3.1.md
@@ -202,7 +202,7 @@ Yaml
    After:
 
    ```php
-   Yaml::dump(array('foo' => new A(), 'bar' => 1), 0, 0, false, Yaml::DUMP_OBJECT);
+   Yaml::dump(array('foo' => new A(), 'bar' => 1), 0, 0, Yaml::DUMP_OBJECT);
    ```
 
  * The `!!php/object` tag to indicate dumped PHP objects has been deprecated