diff --git a/Radio-operation.md b/Radio-operation.md
index 60f0f88..3cd7d61 100644
--- a/Radio-operation.md
+++ b/Radio-operation.md
@@ -55,7 +55,7 @@ When the `PTT` is pressed, the 1750 Hz can be activated by pressing [`Function-b
 
 # DTMF calling (decoding)
 
-[DTMF](https://en.wikipedia.org/wiki/Dual-tone_multi-frequency_signaling) calling can be turned on in the menu `D Decd` (DTMF Decoding). You need a computer and programming cable to setup the whole system (use Chirp). You need to change `ANI ID` (programmable from the computer) of each radio to be unique in your network. It is also a good idea to program the list of contacts, their IDs and names.
+[DTMF](https://en.wikipedia.org/wiki/Dual-tone_multi-frequency_signaling) calling can be turned on in the menu `D Decd` (DTMF Decoding). You need a computer and programming cable to setup the whole system (use [Chirp](https://github.com/egzumer/uvk5-chirp-driver/releases)). You need to change `ANI ID` (programmable from the computer) of each radio to be unique in your network. It is also a good idea to program the list of contacts, their IDs and names.
 
 The basic idea is to be able to dial a one particular person (or a group) among many on the same frequency. If you turn on the DTMF calling on a given channel your radio will be silent on that channel until an incoming call arrives with the destination ID matching `ANI ID` of your radio. If you receive the call a time window opens up in which the speaker activates and a person on the other side can talk to you. The time window expires after a delay set in `D Hold` menu entry from the time when incoming signal disappears.