diff --git a/repositories.txt b/repositories.txt
index 1d369942..46e03892 100644
--- a/repositories.txt
+++ b/repositories.txt
@@ -4703,3 +4703,4 @@ https://github.com/ArmDeveloperEcosystem/DA16200-WiFi-Library-for-Arduino
 https://github.com/xiangfuli/Arduino-L298NDriver
 https://github.com/sichel94/GUVB-C31SM
 https://github.com/pixetto/PixettoLite
+https://github.com/centaq/arduino-modbus-slave-rtu-over-rs485