diff --git a/variants/xiao_nrf54l15/README.md b/variants/xiao_nrf54l15/README.md
index fe75713e1..11ff5e5a7 100644
--- a/variants/xiao_nrf54l15/README.md
+++ b/variants/xiao_nrf54l15/README.md
@@ -4,7 +4,11 @@ https://wiki.seeedstudio.com/semtech_lr2021_evk_getting_started/
 
 Supports LoRa CSS on 868 MHz and 2.4 GHz bands
 
+Recommanded channels for ISM2400 (2400-2483 MHz) : 2403 MHz, 2425 MHz, 2479 MHz with DC 100%. [ref1](https://www.semtech.com/uploads/technology/LoRa/phy-layer-2g4.pdf), [ref2](https://github.com/CampusIoT/datasets/tree/main/TourPerret2G4)
+
+
 ## TODO
+* [ ] support USER button (send advert on double click)
 * [ ] support OLED screen
 * [ ] fix persistence of BLE pairing
 * [ ] add FLRC modulation for high-speed datarates