diff --git a/CHANGELOG.md b/CHANGELOG.md
index dbe93ab..a31c5ae 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,10 @@ henceforth should be documented here.
 ## Master (Unreleased)
 ### Added
 
+*   Add support for `mongoid 4.0`  without associations ([pull request](https://github.com/activerecord-hackery/ransack/pull/407)).
+
+    *Zhomart Mukhamejanov*
+
 ### Fixed
 
 *   Add support and tests for passing stringy booleans for ransackable scopes
diff --git a/README.md b/README.md
index 5d5730e..0ab653e 100644
--- a/README.md
+++ b/README.md
@@ -26,7 +26,7 @@ instead.
 
 ## Getting started
 
-Ransack is currently compatible with Rails 3.x, 4.0, 4.1 and 4.2.
+Ransack is currently compatible with Rails 3.x, 4.0, 4.1 and 4.2. Since 1.6.0 added support for Mongoid 4.0 without associations.
 
 In your Gemfile, for the last officially released Ransack gem:
 
@@ -595,6 +595,19 @@ en:
         title: Old Ransack Namespaced Title
 ```
 
+### Mongoid
+
+Usage of ransack with Mongoid is same as with ActiveRecord. Currently ransack doesn't support Mongoid's associations. [Here](http://ransack-mongodb-demo.herokuapp.com/) is the demo application (demo source code is [here](https://github.com/Zhomart/ransack-mongodb-demo). `result` method of `Ransack::Search` returns `Mongoid::Criteria`:
+
+```ruby
+@q = Person.search(params[:q])
+@people = @q.result # => Mongoid::Criteria
+
+# or you can add more Mongoid queries
+@people = @q.result.active.order_by(updated_at: -1).limit(10)
+```
+
+
 ## Semantic Versioning
 
 Ransack attempts to follow semantic versioning in the format of `x.y.z`, where: