diff --git a/Userland/Libraries/LibWeb/ARIA/ARIAMixin.idl b/Userland/Libraries/LibWeb/ARIA/ARIAMixin.idl
index f608e238a94..b679d0827ac 100644
--- a/Userland/Libraries/LibWeb/ARIA/ARIAMixin.idl
+++ b/Userland/Libraries/LibWeb/ARIA/ARIAMixin.idl
@@ -36,6 +36,7 @@ interface mixin ARIAMixin {
 	attribute DOMString? ariaPosInSet;
 	attribute DOMString? ariaPressed;
 	attribute DOMString? ariaReadOnly;
+	attribute DOMString? ariaRelevant;
 
 	attribute DOMString? ariaRequired;
 	attribute DOMString? ariaRoleDescription;