diff --git a/registry.txt b/registry.txt
index 8e8dc9e8..de5cb884 100644
--- a/registry.txt
+++ b/registry.txt
@@ -6128,3 +6128,4 @@ https://github.com/RobTillaart/PCA9551.git|Contributed|PCA9551
 https://github.com/RobTillaart/PCA9552.git|Contributed|PCA9552
 https://github.com/tedtoal/msToString.git|Contributed|msToString
 https://github.com/AbdoullahBougataya/QCFA.git|Contributed|QCFA
+https://github.com/CMB27/ModbusRTUMaster.git|Contributed|ModbusRTUMaster