diff --git a/%E3%83%86%E3%83%BC%E3%83%96%E3%83%AB%E5%AE%9A%E7%BE%A9%E6%9B%B8%3Athreads.md b/%E3%83%86%E3%83%BC%E3%83%96%E3%83%AB%E5%AE%9A%E7%BE%A9%E6%9B%B8%3Athreads.md
index 3c851d3..67cfb95 100644
--- a/%E3%83%86%E3%83%BC%E3%83%96%E3%83%AB%E5%AE%9A%E7%BE%A9%E6%9B%B8%3Athreads.md
+++ b/%E3%83%86%E3%83%BC%E3%83%96%E3%83%AB%E5%AE%9A%E7%BE%A9%E6%9B%B8%3Athreads.md
@@ -4,3 +4,4 @@
 | id | 代理キー | BIGINT |  |  |   | |
 | name | スレッド名 | VARCHAR | 255 | | | |
 | description | スレッド説明 | TEXT | | ◯ | NULL | |
+| created_at | 作成日時 | DATETIME | | | | |
\ No newline at end of file