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 b9d589a..4b1c679 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
@@ -21,6 +21,7 @@ TagNameRule.apply! に TagName に対する置換処理を入れる．
 | :------: | :------------: | :---------: | :--------: | :----------: | :-----------: |
 | 10 | `\*` | `_` | Time.current | Time.current | NULL |
 | 20 | `\?` | `_` | Time.current | Time.current | NULL |
+| 25 | `\/` | `_` | Time.current | Time.current | NULL |
 | 30 | `_+` | `_` | Time.current | Time.current | NULL |
 | 40 | `_$` |  | Time.current | Time.current | NULL |
 | 45 | `^(.+?\:)?_` | `\1` | Time.current | Time.current | NULL |