diff --git a/README.org b/README.org
index 2a44bf9..07734ae 100644
--- a/README.org
+++ b/README.org
@@ -10,6 +10,12 @@ PeerTubeify is not affiliated with PeerTube.
 
 Get it on [[https://addons.mozilla.org/en-US/firefox/addon/peertubeify][Firefox]] or [[https://chrome.google.com/webstore/detail/peertubeify/gegmikcnabpilimgelhabaledkcikdab][Chrome/Chromium]].
 
+* How does it work?
+
+Most videos have the same title on YouTube and PeerTube. Hence — for now? —
+PeerTubeify uses the =/search/videos= endpoint of the PeerTube API to check if a
+video with the same title exists.
+
 * Contributing
   Yes please!