gh-116991: Improve `pygen --help` for `python` subparser (#116992)

diff --git a/Tools/peg_generator/pegen/__main__.py b/Tools/peg_generator/pegen/__main__.py
index 262c8a6db68f6ed63954b2efd6b6c65b66b66bd8..0b0b4b291c2b0ecd012e3c09a1e6734ae12a037e 100755 (executable)
--- a/Tools/peg_generator/pegen/__main__.py
+++ b/Tools/peg_generator/pegen/__main__.py
@@ -107,7 +107,10 @@ c_parser.add_argument(
     help="Suppress code emission for rule actions",
 )
 
-python_parser = subparsers.add_parser("python", help="Generate Python code")
+python_parser = subparsers.add_parser(
+    "python",
+    help="Generate Python code, needs grammar definition with Python actions",
+)
 python_parser.set_defaults(func=generate_python_code)
 python_parser.add_argument("grammar_filename", help="Grammar description")
 python_parser.add_argument(