diff --git a/README.md b/README.md
index e00c8c5..8b36de1 100644
--- a/README.md
+++ b/README.md
@@ -337,7 +337,9 @@ and are gone.
   picture; the iframe still exists at the 200×113 the player is constructed
   with, parked by `.player-offscreen` at `left: -9999px`. `display: none` and a
   zero-sized frame are both grounds for a browser to stop the audio, so neither
-  is available. The positioning belongs to that wrapper rather than the frame
+  is available. Audio from the off-screen frame is confirmed by ear in Chrome
+  and Firefox — headless cannot check this, because no YouTube video plays there
+  at all. The positioning belongs to that wrapper rather than the frame
   because `YT.Player` replaces the element it is handed, taking any class on it
   along. The artwork itself comes from `/dz/artist/{artistId}/image`, which
   Deezer redirects to its CDN and the Worker proxies, so no artwork has to be