diff --git a/locales/en-US.yml b/locales/en-US.yml
index d1558160f5..aa5873f362 100644
--- a/locales/en-US.yml
+++ b/locales/en-US.yml
@@ -1301,7 +1301,7 @@ mobile/views/pages/settings.vue:
   signout: "Sign out"
   sound: "Sounds"
   enable-sounds: "Enable sounds"
-  mark-as-read-all-unread-notes: "Do you wish to mark all notifications as read?"
+  mark-as-read-all-unread-notes: "すべての投稿を既読にする"
 mobile/views/pages/user.vue:
   follows-you: "Follows you"
   following: "Following"