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diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index 7a3dfd34dc..73f9212371 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,5 +1,21 @@
 ## Rails 4.0.0 (unreleased) ##
 
+*   Add `:default` and `:null` options to `column_exists?`.
+
+        column_exists?(:testings, :taggable_id, :integer, null: false)
+        column_exists?(:testings, :taggable_type, :string, default: 'Photo')
+
+    *Aleksey Magusev*
+
+*   `ActiveRelation#inspect` no longer calls `#to_a`. This means that in places
+    where `#inspect` is implied (such as in the console), creating a relation
+    will not execute it anymore, you'll have to call `#to_a` when necessary:
+
+       User.where(:age => 30)      # => returns the relation
+       User.where(:age => 30).to_a # => executes the query and returns the loaded objects, as before
+
+    *Brian Cardarella*
+
 *   Add `collate` and `ctype` support to PostgreSQL. These are available for PostgreSQL 8.4 or later.
     Example: