Added a link to the excel XML format we are using ref AccelerationNet#4

Author: bobbysmith007

buildnode-excel.asd

@@ -8,7 +8,10 @@
 (in-package :net.acceleration.buildnode.system)
 
 (defsystem :buildnode-excel
-  :description "Tool for building up an xml dom of an excel spreadsheet nicely."
+  :description "Tool for building up an xml dom of an excel spreadsheet nicely.
+  Uses this XML format:
+  http://msdn.microsoft.com/en-us/library/aa140066%28office.10%29.aspx
+  "
   :components
   ((:module :src
 	    :serial T