Add a reminder in the README to only change coffee source.

README.md

@@ -33,6 +33,10 @@ Very daring.
 
 Fork, hack, possibly even add some tests, then send a pull request :)
 
+Remember that Morris.js is a coffeescript project. Please make your changes in
+the `.coffee` files, not in the compiled javascript files in the root directory
+of the project.
+
 ### Developer quick-start
 
 You'll need [node.js](https://nodejs.org).  I recommend using

examples/area.html

@@ -17,10 +17,12 @@
 Morris.Area({
   element: 'graph',
   data: [
-    {x: '2011 Q1', y: 3, z: 3},
-    {x: '2011 Q2', y: 2, z: 0},
+    {x: '2010 Q4', y: 3, z: 7},
+    {x: '2011 Q1', y: 3, z: 4},
+    {x: '2011 Q2', y: null, z: 1},
     {x: '2011 Q3', y: 2, z: 5},
-    {x: '2011 Q4', y: 4, z: 4}
+    {x: '2011 Q4', y: 8, z: 2},
+    {x: '2012 Q1', y: 4, z: 4}
   ],
   xkey: 'x',
   ykeys: ['y', 'z'],