diff --git a/Protocols_Details.md b/Protocols_Details.md
index 0ee979c..fc1fa7f 100644
--- a/Protocols_Details.md
+++ b/Protocols_Details.md
@@ -102,6 +102,8 @@ Option is used to change the servo refresh rate. A value of 0 gives 50Hz (min),
 
 If telemetry is incomplete (missing RX RSSI for example), it means that you have to upgrade your RX firmware to version 1.6 or later. You can do it from an original Flysky TX or using a STLink like explained in [this tutorial](https://www.rcgroups.com/forums/showthread.php?2677694-How-to-upgrade-Flysky-Turnigy-iA6B-RX-to-firmware-1-6-with-a-ST-Link).
 
+AFHDS2A_LQI_CH is a feature which is disabled by defaut in the _config.h file. When enabled, it makes LQI (Link Quality Indicator) available on one of the RX ouput channel (5-14).
+
 CH1|CH2|CH3|CH4|CH5|CH6|CH7|CH8|CH9|CH10|CH11|CH12|CH13|CH14
 ---|---|---|---|---|---|---|---|---|---|---|---|---|---
 A|E|T|R|CH5|CH6|CH7|CH8|CH9|CH10|CH11|CH12|CH13|CH14