diff --git a/repositories.txt b/repositories.txt
index 9e0ff3555..3142e340a 100644
--- a/repositories.txt
+++ b/repositories.txt
@@ -3580,6 +3580,7 @@ https://github.com/RobTillaart/MCP23S08
 https://github.com/RobTillaart/MCP23S17
 https://github.com/RobTillaart/MCP4725
 https://github.com/RobTillaart/MCP9808_RT
+https://github.com/RobTillaart/MHZCO2
 https://github.com/RobTillaart/MINMAX
 https://github.com/RobTillaart/ML8511
 https://github.com/RobTillaart/moduloMap