diff --git a/legacy.yml b/legacy.yml
new file mode 100644
index 0000000..9e9e7ed
--- /dev/null
+++ b/legacy.yml
@@ -0,0 +1,6 @@
+---
+Name: iframelegacy
+---
+SilverStripe\ORM\DatabaseAdmin:
+  classname_value_remapping:
+    IFramePage: 'SilverStripe\IFrame\IFramePage'