diff --git a/registry.txt b/registry.txt
index fff6beb5..f1b6492c 100644
--- a/registry.txt
+++ b/registry.txt
@@ -3204,3 +3204,4 @@ https://github.com/pothos/arduino-n64-controller-library.git|Contributed|N64Cont
 https://github.com/RobTillaart/MCP4725.git|Contributed|MCP4725
 https://github.com/MeelonUsk/tb9051ftg-motor-carrier-arduino.git|Contributed|TB9051FTGMotorCarrier
 https://github.com/RobTillaart/MAX31855_RT.git|Contributed|MAX31855_RT
+https://github.com/RobTillaart/MCP23017_RT.git|Contributed|MCP23017_RT