diff --git a/worklets/Overview.bs b/worklets/Overview.bs
index f5629362..1fa9face 100644
--- a/worklets/Overview.bs
+++ b/worklets/Overview.bs
@@ -318,7 +318,7 @@ The {{Worklet}} object provides the capability to add module scripts into its as
 <pre class='idl'>
 [Exposed=Window]
 interface Worklet {
-    [NewObject] Promise&lt;void> addModule(USVString moduleURL, optional WorkletOptions options = {});
+    [NewObject] Promise&lt;undefined> addModule(USVString moduleURL, optional WorkletOptions options = {});
 };
 
 dictionary WorkletOptions {