diff --git a/registry.txt b/registry.txt
index 8cc67b7e..0a9cd8b2 100644
--- a/registry.txt
+++ b/registry.txt
@@ -2964,3 +2964,4 @@ https://github.com/DBSStore/DBS_AVRIII.git|Contributed|DBS-AVRIII
 https://github.com/pstolarz/CoopThreads.git|Contributed|CoopThreads
 https://github.com/sparkfun/SparkFun_RV-8803_Arduino_Library.git|Contributed|SparkFun Qwiic RTC RV8803 Arduino Library
 https://github.com/ai-techsystems/arduino.git|Contributed|deepC
+https://github.com/RobTillaart/CountDown.git|Contributed|CountDown