diff --git a/README.md b/README.md
index f187c92..dbaddf4 100644
--- a/README.md
+++ b/README.md
@@ -59,6 +59,7 @@ __Supported cables:__
 * anlogic JTAG adapter
 * [digilent_hs2](https://store.digilentinc.com/jtag-hs2-programming-cable/): jtag programmer cable from digilent
 * [DirtyJTAG](https://github.com/jeanthom/DirtyJTAG): JTAG probe firmware for STM32F1
+  (Best to use release (1.4 or newer) or limit the --freq to 600000 with older releases. New version https://github.com/jeanthom/DirtyJTAG/tree/dirtyjtag2 is also supported)
 * Intel USB Blaster: jtag programmer cable from intel/altera
 * JTAG-HS3: jtag programmer cable from digilent
 * FT2232: generic programmer cable based on Ftdi FT2232