diff --git a/README.md b/README.md
index 03c12ce..ffda965 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,12 @@
 
 Resources for the Tytera (TYT) MD398 (aka Radioddity GD-55).
 
-## Boot modes
+## General Information
+
+The programming cable is actually a common USB to TTL serial interface (**not** an actual USBN device).
+It's still not impossible the radio could appear as a DFU usb device for uprgades however.
+
+## Boot Modes
 
 Different boot modes seem to be available: