diff --git a/repositories.txt b/repositories.txt
index 7f1e6b46..98fbd52d 100644
--- a/repositories.txt
+++ b/repositories.txt
@@ -1,3 +1,4 @@
+https://github.com/SolderedElectronics/Soldered-MCP23017-Port-Expander-Arduino-Library
 https://github.com/SolderedElectronics/Soldered-Obstacle-Sensor-Arduino-Library
 https://github.com/SolderedElectronics/Soldered-LCD-library
 https://github.com/SolderedElectronics/Soldered-Ultrasonic-Sensor-easyC-Arduino-Library