diff --git a/registry.txt b/registry.txt
index 26fc3136..0352a94a 100644
--- a/registry.txt
+++ b/registry.txt
@@ -1386,3 +1386,4 @@ https://github.com/JChristensen/Timezone.git|Contributed|Timezone
 https://github.com/JChristensen/MCP9808.git|Contributed|MCP9808
 https://github.com/sparkfun/SparkFun_BNO080_Arduino_Library.git|Contributed|SparkFun BNO080 Cortex Based IMU
 https://github.com/cloud4rpi/cloud4rpi-esp-arduino.git|Contributed|cloud4rpi-esp-arduino
+https://github.com/avandalen/avdweb_FreqPeriodCounter.git|Contributed|FreqPeriodCounter