diff --git a/tasks/download_report.rake b/tasks/download_report.rake
index bf97375..66b8df3 100644
--- a/tasks/download_report.rake
+++ b/tasks/download_report.rake
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-desc 'download cybersource monthly report'
+desc 'download cybersource monthly report, date format [9999-99-99]'
 task :download_report, [:date] do |_, args|
   require_relative '../cyber_source/download_payment_batch_detail_report'
   result = DownloadPaymentBatchDetailReport.new(args[:date])