diff --git a/README.md b/README.md
index c855212..0664ef6 100644
--- a/README.md
+++ b/README.md
@@ -53,6 +53,7 @@ What you can do with this app:
 # Other similar or related projects
 - Hardware
   - ESP32 LoRa APRS modem (used with this application for testing): https://github.com/sh123/esp32_loraprs
+  - ESP32 Codec2 library: https://github.com/sh123/esp32_codec2_arduino
   - Minimal Arduino LoRa KISS modem: https://github.com/sh123/lora_arduino_kiss_modem
   - Minimal Arduino NRF24 KISS modem: https://github.com/sh123/nrf24l01_arduino_kiss_modem
 - Software: