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diff --git a/docs/users_guide/8.0.1-notes.rst b/docs/users_guide/8.0.1-notes.rst
index aaf9ca3825..c36c721be5 100644
--- a/docs/users_guide/8.0.1-notes.rst
+++ b/docs/users_guide/8.0.1-notes.rst
@@ -274,6 +274,14 @@ Compiler
expressivity may come with a high price in terms of compilation time and
memory consumption, it is turned off by default.
+- :ghc-flag:`-this-package-key` has been renamed again (hopefully for the last time!)
+ to :ghc-flag:`-this-unit-id`. The renaming was motivated by the fact that
+ the identifier you pass to GHC here doesn't have much to do with packages:
+ you may provide different unit IDs for libraries which are in the same
+ package. :ghc-flag:`-this-package-key` is deprecated; you should use
+ :ghc-flag:`-this-unit-id` or, if you need compatibility over multiple
+ versions of GHC, :ghc-flag:`-package-name`.
+
GHCi
~~~~