diff --git a/registry.txt b/registry.txt
index e7aa443d..1a90aa42 100644
--- a/registry.txt
+++ b/registry.txt
@@ -2048,3 +2048,4 @@ https://github.com/Programmable-Air/Code.git|Contributed|programmable_air
 https://github.com/paulo-raca/Arduino_AsyncLiquidCrystal.git|Contributed|AsyncLiquidCrystal
 https://github.com/RobotCing/Attiny85_IO.git|Contributed|Attiny85_IO
 https://github.com/RobotCing/Attiny85_IO_basic.git|Contributed|Attiny85_IO_basic
+https://github.com/RobotCing/Attiny84_IO.git|Contributed|Attiny84_IO