diff --git a/pkg/spec/src/types.ts b/pkg/spec/src/types.ts
index c556e0e..62d7ed2 100644
--- a/pkg/spec/src/types.ts
+++ b/pkg/spec/src/types.ts
@@ -125,6 +125,7 @@ export interface WebState extends State {
 export interface Extracted<T> {
   readonly current: T;
   readonly previous: T | undefined;
+  named(name: string): Extracted<T>;
 }
 
 export interface Point {