diff --git a/README.md b/README.md
index c638c5e..5ff89d0 100644
--- a/README.md
+++ b/README.md
@@ -69,6 +69,10 @@ m5stack Screw Kit:
 
 https://shop.m5stack.com/products/16-pcs-m3-12-18-25-32-screw-with-allen-key
 
+m5stack ATOMIC PortABC Extension Base:
+
+https://shop.m5stack.com/products/atomic-portabc-extension-base
+
 ## TODO:
 
 - UV Light intencity