diff --git a/Parser/Python.asdl b/Parser/Python.asdl
index fc1a6da..c5b64a9 100644
--- a/Parser/Python.asdl
+++ b/Parser/Python.asdl
@@ -1,4 +1,4 @@
--- ASDL's five builtin types are identifier, int, string, object, bool
+-- ASDL's five builtin types are identifier, int, string, object
 
 module Python version "$Revision$"
 {