diff --git a/2-ui/1-document/01-browser-environment/article.md b/2-ui/1-document/01-browser-environment/article.md
index 49d61807..89c36eb7 100644
--- a/2-ui/1-document/01-browser-environment/article.md
+++ b/2-ui/1-document/01-browser-environment/article.md
@@ -24,7 +24,7 @@ function sayHi() {
   alert("Hello");
 }
 
-alert(window.f); // global function is a property of window
+alert(window.sayHi); // global function is a property of window
 ```
 
 And here we use it as a browser window, to see the window height:
diff --git a/figures.sketch b/figures.sketch
index ed9b0654..3d7719f7 100644
Binary files a/figures.sketch and b/figures.sketch differ