jQuery Grid Plugin - jqGrid

I created a grid according to the instructions at http://www.trirand.com/jqgridw.....  It went well.  I then modified the colums to try to make the Note colum editable by changing the definition to:

colModel :[

{name:'invid', index:'invid', width:55},

{name:'invdate', index:'invdate', width:90},

{name:'amount', index:'amount', width:80, align:'right'},

{name:'tax', index:'tax', width:80, align:'right'},

{name:'total', index:'total', width:80, align:'right'},

{name:'note', index:'note',editable:true,edittype:'text', width:150, sortable:false}

Using Firebug I looked to see what js files were loaded and the grid.common.js and grid.celledit.js files are present and loaded.  What else do I need to do to make it editable?  

Thanks,

Jim.