Add a note that config.py must remain compatible with Python 3.4
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/scripts/config.py b/scripts/config.py
index f045f98..470c63d 100755
--- a/scripts/config.py
+++ b/scripts/config.py
@@ -7,6 +7,11 @@
if 'MBEDTLS_RSA_C' in config: print('RSA is enabled')
"""
+# Note that as long as Mbed TLS 2.28 LTS is maintained, the version of
+# this script in the mbedtls-2.28 branch must remain compatible with
+# Python 3.4. The version in development may only use more recent features
+# in parts that are not backported to 2.28.
+
## Copyright The Mbed TLS Contributors
## SPDX-License-Identifier: Apache-2.0
##