1 files changed, 9 insertions, 1 deletions
diff --git a/guides/source/4_0_release_notes.md b/guides/source/4_0_release_notes.md
index c3921ea541..cce5bc5331 100644
--- a/guides/source/4_0_release_notes.md
+++ b/guides/source/4_0_release_notes.md
@@ -538,7 +538,7 @@ Active Record
 
 *   `mysql` and `mysql2` connections will set `SQL_MODE=STRICT_ALL_TABLES` by default to avoid silent data loss. This can be disabled by specifying `strict: false` in `config/database.yml`.
 
-*   Added default order to `ActiveRecord::Base#first` to assure consistent results among diferent database engines. Introduced `ActiveRecord::Base#take` as a replacement to the old behavior.
+*   Added default order to `ActiveRecord::Base#first` to assure consistent results among different database engines. Introduced `ActiveRecord::Base#take` as a replacement to the old behavior.
 
 *   Added an `:index` option to automatically create indexes for `references` and `belongs_to` statements in migrations. This can be either a boolean or a hash that is identical to options available to the `add_index` method:
 
@@ -652,6 +652,14 @@ Active Record
 
 *   PostgreSQL hstore types are automatically deserialized from the database.
 
+*   Added `#update_columns` method which updates the attributes from the passed-in hash without calling save, hence skipping validations and callbacks. `ActiveRecordError` will be raised when called on new objects or when at least one of the attributes is marked as read only.
+
+    ```ruby
+    post.attributes # => {"id"=>2, "title"=>"My title", "body"=>"My content", "author"=>"Peter"}
+    post.update_columns({title: 'New title', author: 'Sebastian'}) # => true
+    post.attributes # => {"id"=>2, "title"=>"New title", "body"=>"My content", "author"=>"Sebastian"}
+    ```
+
 ### Deprecations
 
 *   Deprecated most of the 'dynamic finder' methods. All dynamic methods except for `find_by_...` and `find_by_...!` are deprecated. Here's how you can rewrite the code: