add comment

spec/models/account_spec.rb

@@ -134,7 +134,7 @@ RSpec.describe Account do
         MedicalRelease,
         MiscRelease,
         MatchingRequest,
-        ActionMailbox::InboundEmail
+        ActionMailbox::InboundEmail # This is Rails model, we are not using it and it is NOT added to the Account#storage_total calculation
       ]
       Rails.application.eager_load!
       ActiveRecord::Base.descendants.each do |model|