diff --git a/locales/en-US/browser/browser/zen-general.ftl b/locales/en-US/browser/browser/zen-general.ftl
index bf4aa62d5..3792765fe 100644
--- a/locales/en-US/browser/browser/zen-general.ftl
+++ b/locales/en-US/browser/browser/zen-general.ftl
@@ -121,3 +121,14 @@ zen-site-data-panel-feature-callout-subtitle = Click the icon to manage site set
 zen-open-link-in-glance =
     .label = Open Link in Glance
     .accesskey = G
+
+zen-sidebar-notification-updated-heading = Update Complete!
+
+# See ZenSidebarNotification.mjs to see how these would be used
+
+zen-sidebar-notification-updated-label = What's new in { -brand-short-name }
+zen-sidebar-notification-updated-tooltip =
+    .title = View Release Notes
+zen-sidebar-notification-restart-safe-mode-label = Something broke?
+zen-sidebar-notification-restart-safe-mode-tooltip =
+    .title = Restart in Safe Mode