diff --git a/doc/release/upcoming_changes/22540.expired.rst b/doc/release/upcoming_changes/22540.expired.rst
index ec445e3764bb..3c5cb11c3a6e 100644
--- a/doc/release/upcoming_changes/22540.expired.rst
+++ b/doc/release/upcoming_changes/22540.expired.rst
@@ -1,3 +1,5 @@
-* Passing dtype instances other than the default ones to
-  ``dtype=`` or ``signature=` in ufuncs will now raise a
-  ``TypeError``.  (Initially deprecated in NumPy 1.21.)
+* Passing dtype instances other than the canonical (mainly native byte-order)
+  ones to ``dtype=`` or ``signature=` in ufuncs will now raise a ``TypeError``.
+  We recommend passing the strings ``"int8"`` or scalar types ``np.int8``
+  since the byte-order, datetime/timedelta unit, etc. are never enforced.
+  (Initially deprecated in NumPy 1.21.)