diff --git a/en/08_Changelogs/5.4.0.md b/en/08_Changelogs/5.4.0.md
index ba537e0e..8cbd7aee 100644
--- a/en/08_Changelogs/5.4.0.md
+++ b/en/08_Changelogs/5.4.0.md
@@ -182,6 +182,7 @@ The `SilverStripe\CMS\Model\SiteTree.DESCRIPTION` localisation key (along with t
 - [`DBEnum::flushCache()`](api:SilverStripe\ORM\FieldType\DBEnum::flushCache()) has been deprecated. Use [`DBEnum::reset()`](api:SilverStripe\ORM\FieldType\DBEnum::reset()) instead.
 - The [`BaseElement.description`](api:DNADesign\Elemental\Models\BaseElement->description) configuration property has been deprecated. Use [`DataObject.class_description`](api:SilverStripe\ORM\DataObject->class_description) instead.
 - The [`SiteTree.description`](api:SilverStripe\CMS\Model\SiteTree->description) configuration property has been deprecated. Use [`DataObject.class_description`](api:SilverStripe\ORM\DataObject->class_description) instead.
+- [`FormField::extendValidationResult()`](api:SilverStripe\Forms\FormField::extendValidationResult()) has been deprecated. Use `extend()` directly instead.
 
 ## Bug fixes