diff --git a/registry.txt b/registry.txt
index 4c870c1d..c6adcd35 100644
--- a/registry.txt
+++ b/registry.txt
@@ -2065,3 +2065,4 @@ https://github.com/hideakitai/CRC.git|Contributed|CRC
 https://github.com/hideakitai/Filters.git|Contributed|Filters
 https://github.com/hideakitai/Convert.git|Contributed|Convert
 https://github.com/hideakitai/Debug.git|Contributed|Debug
+https://github.com/hideakitai/I2CExtension.git|Contributed|I2CExtension