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-rw-r--r--Grammar/Tokens5
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diff --git a/Grammar/Tokens b/Grammar/Tokens
index e40a4437afb..0547e6ed08f 100644
--- a/Grammar/Tokens
+++ b/Grammar/Tokens
@@ -1,3 +1,8 @@
+# When adding new tokens, remember to update the PEG generator in
+# Tools/peg_generator/pegen/parser_generator.py
+# This will ensure that older versions of Python can generate a Python parser
+# using "python -m pegen python <GRAMMAR FILE>".
+
ENDMARKER
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