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diff --git a/ext/readme.txt b/ext/readme.txt
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+All the code contained under ./contrib/ext is not part of the ChibiOS project and
+supplied as-is without any additional warranty by ChibiOS. For ownership and
+copyright statements see the license details inside the code.
+
+Some modules may contain changes from the ChibiOS team in order to increase
+compatibility or usability with ChibiOS itself.