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diff --git a/src/hyper/pages/releaseNotes.ht b/src/hyper/pages/releaseNotes.ht
index bfef81a9..2188cc87 100644
--- a/src/hyper/pages/releaseNotes.ht
+++ b/src/hyper/pages/releaseNotes.ht
@@ -51,6 +51,10 @@ contains additions of new features and domains including:
attribute. The latter was removed. In general, attributes are
strongly discouraged in new algebra codes.
+ The category ShallowlyMutableAggregate is added. It provides a
+ more principled alternative to the time-honored shallowlyMutable
+ attribute, which is now discontinued.
+
Attributes are deprecated and will be removed in future releases.
The category KeyedDictionary now extends EltableAggregate.