diff --git a/public/locales/ja/tools.json b/public/locales/ja/tools.json
index 1c591ea..0c328b6 100644
--- a/public/locales/ja/tools.json
+++ b/public/locales/ja/tools.json
@@ -461,7 +461,7 @@
     "splitView": "分割ビュー",
     "alternating": "交互に",
     "leftDocument": "左の文書",
-    "rightDocument": "正しい文書",
+    "rightDocument": "右の文書",
     "original": "オリジナル",
     "modified": "修正済み",
     "searchChanges": "検索の変更...",