diff --git a/app/models/concerns/file_validation_concern.rb b/app/models/concerns/file_validation_concern.rb
index a9284212f..a3237d43f 100644
--- a/app/models/concerns/file_validation_concern.rb
+++ b/app/models/concerns/file_validation_concern.rb
@@ -1,6 +1,10 @@
 module FileValidationConcern
   extend ActiveSupport::Concern
   class_methods do
+    # This method works around missing `%{min_size}` and `%{max_size}` variables in active_record_validation
+    # default error message.
+    #
+    # Hopefully this will be fixed upstream in https://github.com/igorkasyanchuk/active_storage_validations/pull/134
     def file_size_validation(file_max_size = 200.megabytes)
       { less_than: file_max_size, message: I18n.t('errors.messages.file_size_out_of_range', file_size_limit: ActiveSupport::NumberHelper.number_to_human_size(file_max_size)) }
     end