diff --git a/repositories.txt b/repositories.txt
index edde2ea3..6a9c8b06 100644
--- a/repositories.txt
+++ b/repositories.txt
@@ -3514,6 +3514,7 @@ https://github.com/RobTillaart/DS18B20_INT
 https://github.com/RobTillaart/DS18B20
 https://github.com/RobTillaart/DS28CM00
 https://github.com/RobTillaart/ellipse
+https://github.com/RobTillaart/fast_math
 https://github.com/RobTillaart/FastMap
 https://github.com/RobTillaart/FastShiftIn
 https://github.com/RobTillaart/FastShiftInOut