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index 53828db951..12d458a72c 100644
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+++ b/doc/changelog/02-specification-language/10215-rm-maybe-open-proof.rst
@@ -3,3 +3,10 @@
:ref:`advanced-recursive-functions` of the updated documentation
(`#10215 <https://github.com/coq/coq/pull/10215>`_,
by Enrico Tassi).
+
+- The legacy command Add Morphism always opens a proof and cannot be used
+ inside a module type. In order to declare a module type parameter that
+ happens to be a morphism, use ``Parameter Morphism``. See
+ :ref:`deprecated_syntax_for_generalized_rewriting` for the updated
+ documentation (`#10215 <https://github.com/coq/coq/pull/10215>`_,
+ by Enrico Tassi).