diff --git a/%E3%83%86%E3%83%BC%E3%83%96%E3%83%AB%E5%AE%9A%E7%BE%A9%E6%9B%B8%3Atag_name_sanitisation_rules.md b/%E3%83%86%E3%83%BC%E3%83%96%E3%83%AB%E5%AE%9A%E7%BE%A9%E6%9B%B8%3Atag_name_sanitisation_rules.md
index 11296b4..db6353d 100644
--- a/%E3%83%86%E3%83%BC%E3%83%96%E3%83%AB%E5%AE%9A%E7%BE%A9%E6%9B%B8%3Atag_name_sanitisation_rules.md
+++ b/%E3%83%86%E3%83%BC%E3%83%96%E3%83%AB%E5%AE%9A%E7%BE%A9%E6%9B%B8%3Atag_name_sanitisation_rules.md
@@ -10,7 +10,6 @@
   - priority
 - 一意制約:
   - source_pattern
-  - replacement
 
 ### 備考
 TagName の before_update に置換処理を入れる．