diff --git a/registry.txt b/registry.txt
index e8ea8b32..5bf471c9 100644
--- a/registry.txt
+++ b/registry.txt
@@ -3304,3 +3304,4 @@ https://github.com/mrfaptastic/Easy-IoT-Arduino-CC1101-LORA.git|Contributed|Easy
 https://github.com/RobTillaart/timing.git|Contributed|timing
 https://github.com/RobTillaart/AD520X.git|Contributed|AD520X
 https://github.com/RobTillaart/ADT7470.git|Contributed|ADT7470
+https://github.com/RobTillaart/PCF8591.git|Contributed|PCF8591