diff --git a/en/08_Changelogs/5.4.0.md b/en/08_Changelogs/5.4.0.md
index eff1be68..d3436fc3 100644
--- a/en/08_Changelogs/5.4.0.md
+++ b/en/08_Changelogs/5.4.0.md
@@ -166,6 +166,7 @@ The changes include:
 - [`TemplateParser`](api:SilverStripe\View\TemplateParser) has been deprecated. It will be renamed to `SilverStripe\TemplateEngine\TemplateParser`.
 - [`ElementalAreaController::removeNamespacesFromFields()`](api:DNADesign\Elemental\Controllers\ElementalAreaController::removeNamespacesFromFields()) has been deprecated. It will be removed without equivalent functionality to replace it.
 - [`BaseElement::updateFromFormData()`](api:DNADesign\Elemental\Models\BaseElement::updateFromFormData()) has been deprecated. It will be removed without equivalent functionality to replace it.
+- [`FormField::extendValidationResult()`](api:SilverStripe\Forms\FormField::extendValidationResult()) has been deprecated. Use `extend()` directly instead.
 
 ## Bug fixes