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--- a/activerecord/CHANGELOG.md
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@@ -1,3 +1,25 @@
+## Rails 5.0.0.beta4 (April 27, 2016) ##
+
+*   PostgreSQL: Support Expression Indexes and Operator Classes.
+
+    Example:
+
+        create_table :users do |t|
+          t.string :name
+          t.index 'lower(name) varchar_pattern_ops'
+        end
+
+    Fixes #19090, #21765, #21819, #24359.
+
+    *Ryuta Kamizono*
+
+*   MySQL: Prepared statements support.
+
+    To enable, set `prepared_statements: true` in config/database.yml.
+    Requires mysql2 0.4.4+.
+
+    *Ryuta Kamizono*
+
 *   Schema dumper: Indexes are now included in the `create_table` block
     instead of listed afterward as separate `add_index` lines.