diff --git a/app/controllers/spree/admin/payments_controller.rb b/app/controllers/spree/admin/payments_controller.rb
index c4e4086bff..284830ecf0 100644
--- a/app/controllers/spree/admin/payments_controller.rb
+++ b/app/controllers/spree/admin/payments_controller.rb
@@ -9,6 +9,9 @@ module Spree
       before_action :load_payment, only: [:fire, :show]
       before_action :load_data
       before_action :can_transition_to_payment
+      # We ensure that items are in stock before all screens if the order is in the Payment state.
+      # This way, we don't allow someone to enter credit card details for an order only to be told
+      # that it can't be processed. 
       before_action :ensure_sufficient_stock_lines
 
       respond_to :html