diff --git a/src/common/text/elements/code.js b/src/common/text/elements/code.js
index 2220bb1b8..a94681098 100644
--- a/src/common/text/elements/code.js
+++ b/src/common/text/elements/code.js
@@ -72,12 +72,14 @@ const symbols = [
 	'*',
 	'/',
 	'%',
+	'~',
 	'^',
 	'&',
 	'|',
 	'>',
 	'<',
-	'~'
+	'!',
+	'?'
 ];
 
 // 変数宣言