diff --git a/beautiful-racket/br/demo/hdl/parser.rkt b/beautiful-racket/br/demo/hdl/parser.rkt
index 5b22dd9..873e251 100644
--- a/beautiful-racket/br/demo/hdl/parser.rkt
+++ b/beautiful-racket/br/demo/hdl/parser.rkt
@@ -20,9 +20,9 @@ part : partname /"(" pin-val-pair [/"," pin-val-pair]* /")" /";"
 
 /pin-val-pair : ID  [/"[" bus-range /"]"] /"=" pin-val
 
-@bus-range : (NUMBER | BINARY-NUMBER) [/"." /"." (NUMBER | BINARY-NUMBER)]
+@bus-range : NUMBER [/"." /"." NUMBER]
 
-@pin-val : ID
+@pin-val : ID [/"[" bus-range /"]"]
          | BINARY-NUMBER
          | TRUE
          | FALSE