diff --git a/docs/en/04_Changelogs/4.0.0.md b/docs/en/04_Changelogs/4.0.0.md
index a9e003e98..9cc84429a 100644
--- a/docs/en/04_Changelogs/4.0.0.md
+++ b/docs/en/04_Changelogs/4.0.0.md
@@ -1486,7 +1486,7 @@ configuration setting and will update this for you automatically. You can use
 this to add DB upgrading rules for your own classes.
 
 For example, you could upgrade references to the newly namespaced Banner class by adding
-this to your `mysite/_config/upgrade.yml` file:
+this to your `mysite/_config/legacy.yml` file:
 
 ```yml
 SilverStripe\ORM\DatabaseAdmin: