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diff --git a/os/common/ext/ARM/CMSIS/readme.txt b/os/common/ext/ARM/CMSIS/readme.txt
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+CMSIS is Copyright (C) 2011-2013 ARM Limited. All rights reserved.
+
+This directory contains only part of the CMSIS package. If you need the whole
+package please download it from:
+
+http://www.arm.com