diff --git a/README.md b/README.md
index 1327f9e..8ba2d3d 100644
--- a/README.md
+++ b/README.md
@@ -85,6 +85,8 @@ Enable USB debugging:
 
 > Settings → About Phone → tap Build Number 7 times → Developer Options → USB Debugging
 
+When you plug in the USB cable, a prompt will appear on the phone asking for the connection mode. Choose **"Transferring files / Android Auto"** (also called "File Transfer" on some phones). Do not choose "Transferring images" (PTP) — it restricts file access and breaks ADB browsing.
+
 Accept the "Trust this computer?" prompt on the phone when connecting.
 
 ## Project structure