diff --git a/how-to-use-decoration.md b/how-to-use-decoration.md
index c2dcdcf..5c2a08b 100644
--- a/how-to-use-decoration.md
+++ b/how-to-use-decoration.md
@@ -182,8 +182,8 @@ https://nico.ms/～～～～?from=～～～～
 
 ## コードブロック
 ```
-````
+~~~
 内容
-````
+~~~
 ```
 ![コードブロック](.media/markdown/codeblock.png)
\ No newline at end of file