diff --git a/main/src/main/resources/lang/ja-JP/strings.yml b/main/src/main/resources/lang/ja-JP/strings.yml
index 9b815f120..7850f0bb3 100644
--- a/main/src/main/resources/lang/ja-JP/strings.yml
+++ b/main/src/main/resources/lang/ja-JP/strings.yml
@@ -864,4 +864,5 @@ timerStart: "<red>%s 秒 <green> 以内に処理せよ"
 questErrorReadingFile: "クエスト ファイルの読み取りエラーです。"
 questSaveError: "保存中にエラーが発生しました。"
 noPermission: "You do not have permission to do that."
+duplicateEditor: "You are already using an editor!"
 difference: "The difference is '<data>'."