diff --git a/notes/navigation-in-elements.md b/notes/navigation-in-elements.md
index 7c1c9b5..51bdb8f 100644
--- a/notes/navigation-in-elements.md
+++ b/notes/navigation-in-elements.md
@@ -19,7 +19,7 @@ var app = Elm.Main.init({
 });
 
 // Inform app of browser navigation (the BACK and FORWARD buttons)
-document.addEventListener('popstate', function () {
+window.addEventListener('popstate', function () {
     app.ports.onUrlChange.send(location.href);
 });