diff --git a/app/views/admin/patents/excel_format.xlsx.axlsx b/app/views/admin/patents/excel_format.xlsx.axlsx
index bfed97d..6acaab1 100644
--- a/app/views/admin/patents/excel_format.xlsx.axlsx
+++ b/app/views/admin/patents/excel_format.xlsx.axlsx
@@ -65,7 +65,7 @@ wb.add_worksheet(name: "Patents") do |sheet|
 
   row << t("personal_patent.publication_date")
   row1 << "date"
-  row2 << "Format: YYYY/MM, Example: 2015/12"
+  row2 << "Format: YYYY/MM/DD, Example: 2015/12/31"
 
   row << t("personal_patent.url")
   row1 << "textfield"