diff --git a/drag-orig.html b/drag-orig.html
index 3db8fc3..5c8cc6b 100644
--- a/drag-orig.html
+++ b/drag-orig.html
@@ -65,7 +65,7 @@
 
 </script>
 </head>
-<body>
+<body> <!-- body contains basic information of the program -->
     <h1>Drag and drop demo in a HTML document, using the HTML5 drag and drop API</h1>
     <div> The red box and the orange box can be dragged and dropped between 
     the blue and the green boxes.
@@ -113,4 +113,4 @@ <h1>Drag and drop demo in a HTML document, using the HTML5 drag and drop API</h1
     pageTracker._trackPageview();
     } catch(err) {}</script>
 </body>
-</html>
\ No newline at end of file
+</html>
