-Except for the new MDMF format, we have not made any
-deliberate compatibility changes. However we do not yet have
-the test infrastructure to continuously verify this claim. We
-intend to build such an infrastructure in the future.
+Except for the new optional MDMF format, we have not made any
+intentional compatibility changes. However we do not yet have
+the test infrastructure to continuously verify that all new
+versions are interoperable with previous versions. We intend
+to build such an infrastructure in the future.