Added comments to clearify methods

app/controllers/vehicles_controller.rb

@@ -26,6 +26,7 @@ class VehiclesController < ApplicationController
       end
     end
 
+    # search for a vehicle by vin
     if params[:search]
       @vehicles = Vehicle.search(params[:search]).paginate(:page => params[:page])
       if only_one_non_zero?(@vehicles)
@@ -103,6 +104,8 @@ class VehiclesController < ApplicationController
 
   private
 
+  # checks to see if there is only one item  in an array
+  # @return true if array only has one item
   def only_one_non_zero?( array )
     found_non_zero = false
     array.each do |val|