diff --git a/docs/reference-guides/interactivity-api/api-reference.md b/docs/reference-guides/interactivity-api/api-reference.md
index 29ec67cc17507..46bd20bece0bd 100644
--- a/docs/reference-guides/interactivity-api/api-reference.md
+++ b/docs/reference-guides/interactivity-api/api-reference.md
@@ -776,7 +776,7 @@ Actions are just regular JavaScript functions. Usually triggered by the `data-wp
 ```ts
 const { state, actions } = store("myPlugin", {
   actions: {
-    selectItem: (id?: number) => {
+    selectItem: ( id ) => {
       const context = getContext();
       // `id` is optional here, so this action can be used in a directive.
       state.selected = id || context.id;