Bytes literal.
diff --git a/Parser/Python.asdl b/Parser/Python.asdl
index ea11349..fd47aa0 100644
--- a/Parser/Python.asdl
+++ b/Parser/Python.asdl
@@ -60,6 +60,7 @@
 			 expr? starargs, expr? kwargs)
 	     | Num(object n) -- a number as a PyObject.
 	     | Str(string s) -- need to specify raw, unicode, etc?
+	     | Bytes(string s)
 	     | Ellipsis
 	     -- other literals? bools?