bpo-40334: PEP 617 implementation: New PEG parser for CPython (GH-19503)

Co-authored-by: Guido van Rossum <guido@python.org>
Co-authored-by: Lysandros Nikolaou <lisandrosnik@gmail.com>
diff --git a/Tools/README b/Tools/README
index 6c5fb20..b6d0b18 100644
--- a/Tools/README
+++ b/Tools/README
@@ -23,6 +23,8 @@
 
 parser          Un-parsing tool to generate code from an AST.
 
+peg_generator   PEG-based parser generator (pegen) used for new parser.
+
 pynche          A Tkinter-based color editor.
 
 scripts         A number of useful single-file programs, e.g. tabnanny.py