diff --git a/public/locales/ja/common.json b/public/locales/ja/common.json
index 8a4aa58..680218c 100644
--- a/public/locales/ja/common.json
+++ b/public/locales/ja/common.json
@@ -27,5 +27,7 @@
   "on": "オン",
   "off": "オフ",
   "dark-theme": "ダークテーマ",
-  "light-theme": "ライトテーマ"
-}
+  "light-theme": "ライトテーマ",
+  "theme": "Theme",
+  "system": "System"
+}
\ No newline at end of file