diff --git a/app/javascript/mastodon/locales/fy.json b/app/javascript/mastodon/locales/fy.json
index 3bcf8781da..72b53de811 100644
--- a/app/javascript/mastodon/locales/fy.json
+++ b/app/javascript/mastodon/locales/fy.json
@@ -385,6 +385,7 @@
   "mute_modal.hide_notifications": "Meldingen fan dizze brûker ferstopje?",
   "mute_modal.indefinite": "Foar ûnbepaalde tiid",
   "navigation_bar.about": "Oer",
+  "navigation_bar.advanced_interface": "Yn avansearre webomjouwing iepenje",
   "navigation_bar.blocks": "Blokkearre brûkers",
   "navigation_bar.bookmarks": "Blêdwizers",
   "navigation_bar.community_timeline": "Lokale tiidline",