diff --git a/Backend/README.md b/Backend/README.md
index bc9567d..b6a2995 100644
--- a/Backend/README.md
+++ b/Backend/README.md
@@ -153,6 +153,7 @@ Experimental SFU scaffolding endpoints (`MEDIA_MODE=single_server_sfu`):
 - `POST /streams/:streamSessionId/sfu/subscribe-transport/connect` – participant marks subscribe transport as connected
 - `POST /streams/:streamSessionId/sfu/produce` – camera registers media producer on connected publish transport
 - `POST /streams/:streamSessionId/sfu/consume` – participant creates consumer from available producer
+- `public/mobile-sim.js` now prefers this SFU handshake path automatically when `MEDIA_MODE=single_server_sfu`; legacy mode keeps direct WebRTC + frame relay fallback behavior.
 
 #### Streaming Scale Tradeoffs (Current Prototype)
 - The current implementation is **not production-grade at scale**.