diff --git a/locales/en-US.yml b/locales/en-US.yml
index 2b8b43be9..3ee1c70e4 100644
--- a/locales/en-US.yml
+++ b/locales/en-US.yml
@@ -115,6 +115,9 @@ common:
   reduce-motion: "Reduce motion in UI"
   this-setting-is-this-device-only: "Only for this device"
   do-not-use-in-production: 'As this is for development, do not use this in production.'
+  error:
+    title: '問題が発生しました'
+    retry: 'やり直す'
   reversi:
     drawn: "Draw"
     my-turn: "Your turn"