diff --git a/3-frames-and-windows/03-cross-window-communication/sandbox.view/index.html b/3-frames-and-windows/03-cross-window-communication/sandbox.view/index.html
index 47883061..46dd7b5c 100644
--- a/3-frames-and-windows/03-cross-window-communication/sandbox.view/index.html
+++ b/3-frames-and-windows/03-cross-window-communication/sandbox.view/index.html
@@ -7,7 +7,7 @@
 
 <body>
 
-  <div>The iframe below is has <code>sandbox</code> attribute.</div>
+  <div>The iframe below has the <code>sandbox</code> attribute.</div>
 
   <iframe sandbox src="sandboxed.html" style="height:60px;width:90%"></iframe>
 
