diff --git a/config/locales/client.en.yml b/config/locales/client.en.yml
index 27c3e945c..80c13dabd 100644
--- a/config/locales/client.en.yml
+++ b/config/locales/client.en.yml
@@ -2824,6 +2824,7 @@ en:
         embed_truncate: "Truncate the embedded posts"
         embed_whitelist_selector: "CSS selector for elements that are allowed in embeds"
         embed_blacklist_selector: "CSS selector for elements that are removed from embeds"
+        embed_classname_whitelist: "Allowed CSS class names"
         feed_polling_enabled: "Import posts via RSS/ATOM"
         feed_polling_url: "URL of RSS/ATOM feed to crawl"
         save: "Save Embedding Settings"