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diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index 25b905891f..7062d59a3d 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,3 +1,14 @@
+*   `ActiveRecord::Store` works together with PG `hstore` columns.
+    Fixes #12452.
+
+    *Yves Senn*
+
+*   Fix bug where `ActiveRecord::Store` used a global `Hash` to keep track of
+    all registered `stored_attributes`. Now every subclass of
+    `ActiveRecord::Base` has it's own `Hash`.
+
+    *Yves Senn*
+
 *   Save `has_one` association when primary key is manually set.
 
     Fixes #12302.