diff --git a/README.md b/README.md
index 0946de1..17c77fd 100644
--- a/README.md
+++ b/README.md
@@ -13,6 +13,8 @@ It appears to be using an integrated ARM M7 built into the HR-C3000.
 The programming cable is actually a common USB to TTL serial interface (**not** an actual USB device).
 It's still not impossible the radio could appear as a DFU usb device for upgrades however.
 
+There is an unused ribbon connector on the front side of the mainboard.
+
 ## Boot Modes
 
 Different boot modes seem to be available: