1 files changed, 53 insertions, 1 deletions
diff --git a/guides/source/active_record_callbacks.md b/guides/source/active_record_callbacks.md
index 863da3be72..fbcce325ed 100644
--- a/guides/source/active_record_callbacks.md
+++ b/guides/source/active_record_callbacks.md
@@ -55,7 +55,7 @@ class User < ActiveRecord::Base
 end
 ```
 
-Callbacks can also be registered to only fire on certain lifecycle events:
+Callbacks can also be registered to only fire on certain life cycle events:
 
 ```ruby
 class User < ActiveRecord::Base
@@ -92,6 +92,7 @@ Here is a list with all the available Active Record callbacks, listed in the sam
 * `around_create`
 * `after_create`
 * `after_save`
+* `after_commit/after_rollback`
 
 ### Updating an Object
 
@@ -103,12 +104,14 @@ Here is a list with all the available Active Record callbacks, listed in the sam
 * `around_update`
 * `after_update`
 * `after_save`
+* `after_commit/after_rollback`
 
 ### Destroying an Object
 
 * `before_destroy`
 * `around_destroy`
 * `after_destroy`
+* `after_commit/after_rollback`
 
 WARNING. `after_save` runs both on create and update, but always _after_ the more specific callbacks `after_create` and `after_update`, no matter the order in which the macro calls were executed.
 
@@ -141,6 +144,55 @@ You have initialized an object!
 => #<User id: 1>
 ```
 
+### `after_touch`
+
+The `after_touch` callback will be called whenever an Active Record object is touched.
+
+```ruby
+class User < ActiveRecord::Base
+  after_touch do |user|
+    puts "You have touched an object"
+  end
+end
+
+>> u = User.create(name: 'Kuldeep')
+=> #<User id: 1, name: "Kuldeep", created_at: "2013-11-25 12:17:49", updated_at: "2013-11-25 12:17:49">
+
+>> u.touch
+You have touched an object
+=> true
+```
+
+It can be used along with `belongs_to`:
+
+```ruby
+class Employee < ActiveRecord::Base
+  belongs_to :company, touch: true
+  after_touch do
+    puts 'An Employee was touched'
+  end
+end
+
+class Company < ActiveRecord::Base
+  has_many :employees
+  after_touch :log_when_employees_or_company_touched
+
+  private
+  def log_when_employees_or_company_touched
+    puts 'Employee/Company was touched'
+  end
+end
+
+>> @employee = Employee.last
+=> #<Employee id: 1, company_id: 1, created_at: "2013-11-25 17:04:22", updated_at: "2013-11-25 17:05:05">
+
+# triggers @employee.company.touch
+>> @employee.touch
+Employee/Company was touched
+An Employee was touched
+=> true
+```
+
 Running Callbacks
 -----------------