diff --git a/README.md b/README.md
index f71d362c..08a73218 100644
--- a/README.md
+++ b/README.md
@@ -67,6 +67,8 @@ Both types of vocoder (old and new vocoder radios) are supported.
 The DMR MARC user's database required a 16 MByte SPI Flash memory chip.
 In some VHF Radios is only an 1 MByte SPI Flash installed.
 
+Dual band radios such as the MD2017 and MD-UV380 series are not supported.
+
 ## Known models ##
 
 | Name | vocoder | GPS | exp FW | original FW |