bpo-42485: [Doc] Link to PEP 617 from full grammar specification (GH-23532)
Co-authored-by: Lysandros Nikolaou <lisandrosnik@gmail.com>
diff --git a/Doc/reference/grammar.rst b/Doc/reference/grammar.rst
index acf8376..59b4500 100644
--- a/Doc/reference/grammar.rst
+++ b/Doc/reference/grammar.rst
@@ -13,7 +13,8 @@
group indicates a positive lookahead (i.e., is required to match but
not consumed), while ``!`` indicates a negative lookahead (i.e., is
required _not_ to match). We use the ``|`` separator to mean PEG's
-"ordered choice" (written as ``/`` in traditional PEG grammars).
+"ordered choice" (written as ``/`` in traditional PEG grammars). See
+:pep:`617` for more details on the grammar's syntax.
.. literalinclude:: ../../Grammar/python.gram
:language: peg