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diff --git a/docs/users_guide/9.6.1-notes.rst b/docs/users_guide/9.6.1-notes.rst
index 2e8302ad22..d78ec969b9 100644
--- a/docs/users_guide/9.6.1-notes.rst
+++ b/docs/users_guide/9.6.1-notes.rst
@@ -60,6 +60,8 @@ Language
add an injectivity annotation to the type family in the case that
the type family is in fact injective.
+- Error messages are now assigned unique error codes, of the form ``[GHC-12345]``.
+
Compiler
~~~~~~~~