diff --git a/extensions/lang-english/locale/core.yml b/extensions/lang-english/locale/core.yml
index 809e4ae15..032931395 100644
--- a/extensions/lang-english/locale/core.yml
+++ b/extensions/lang-english/locale/core.yml
@@ -259,6 +259,7 @@ core:
       mark_all_as_read_tooltip: => core.ref.mark_all_as_read
       title: => core.ref.notifications
       tooltip: => core.ref.notifications
+      mark_all_as_read_confirm_text: "Are you sure you want to mark all notifications as read?"
 
     # These translations are used by tooltips displayed for individual posts.
     post: