diff --git a/README.md b/README.md
index e146836..6adf1d4 100644
--- a/README.md
+++ b/README.md
@@ -82,6 +82,8 @@ Pin 8 | Pin 12
 
 
 
+On 1541 shortboard the chip is UC3, and on the long board it's UAB1.
+
 
 
 Many thanks to [Peter Schepers](https://ist.uwaterloo.ca/~schepers/1541par.html).