A list of incompatibilities

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+Potential sources of incompatibilities between Coq V8.0 and V8.1
+----------------------------------------------------------------
+
+(see also file CHANGES)
+
+- Inductive types in Type are now polymorphic over their parameters in
+  Type. This may affect the naming of introduction hypotheses if such
+  an inductive type in Type is used on small types such as Prop or
+  Set: the hypothesis names suffix will default to H instead of X.  As
+  a matter of fact, it is recommended to systematically name the
+  hypotheses that are later refered to in the proof script.
+
+- Some bug fixes may lead to incompatibilities. This is e.g. the case
+  of inversion on Type which failed to rewrite some hypotheses as it
+  did on Prop/Set.
+
+- Add Morphism for the Prop/iff setoid now requires a proof of
+  biimplication instead of a proof of implication.
+
+- The order of arguments in compatibility morphisms changed: the
+  premises and the parameters are now interleaved while the whole
+  bunch of parameters used to come first.
+
+- A few changes in the library (as mentioned in the CHANGES file) may
+  imply the need for local adaptations.
+
+- For changes in the ML interfaces, see file dev/doc/Changes.txt in
+  the main archive.