diff --git a/AlphaX-2chan.md b/AlphaX-2chan.md
index e1993dff..7f347533 100644
--- a/AlphaX-2chan.md
+++ b/AlphaX-2chan.md
@@ -12,4 +12,8 @@ On-board MPXH6400A
 
 ![x](Hardware/Hellen/alphax-2chan-rev-a.jpg)
 
-[See also AlphaX-4chan](AlphaX-4chan)
\ No newline at end of file
+[See also AlphaX-4chan](AlphaX-4chan)
+
+rev B:
+
+* BT fixed
\ No newline at end of file