diff --git a/workers/README.md b/workers/README.md
index 9c01478e3..e12198563 100644
--- a/workers/README.md
+++ b/workers/README.md
@@ -37,7 +37,8 @@ cards degrade: specific item -> repo -> node -> home.
   (http.user_agent contains "WhatsApp") or
   (http.user_agent contains "Pinterestbot") or
   (http.user_agent contains "ZulipURLPreview") or
-  (http.user_agent contains "Bluesky Cardyb")
+  (http.user_agent contains "Bluesky Cardyb") or
+  (http.user_agent contains "Mastodon")
 )
 ```