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diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index e9a66b4c66..5dd5c53e9c 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,3 +1,18 @@
+*   Add bigint primary key support for MySQL.
+
+    Example:
+
+        create_table :foos, id: :bigint do |t|
+        end
+
+    *Ryuta Kamizono*
+
+*   Support for any type primary key.
+
+    Fixes #14194.
+
+    *Ryuta Kamizono*
+
 *   Dump the default `nil` for PostgreSQL UUID primary key.
 
     *Ryuta Kamizono*