diff --git a/src/frontend/langs/en-US.json b/src/frontend/langs/en-US.json
index 02e917b..559b065 100644
--- a/src/frontend/langs/en-US.json
+++ b/src/frontend/langs/en-US.json
@@ -99,6 +99,7 @@
 	"_alertMode": {
 		"note": "Automatic Note",
 		"notification": "Notify to your account (Default)",
+		"both": "両方",
 		"nothing": "Do Nothing",
 		"notificationWarning": "'Notify to your account' option will not be work on legacy versions of Misskey."
 	},