docs/mongo/README.md in flipper-mongo-0.22.1 vs docs/mongo/README.md in flipper-mongo-0.22.2

@@ -22,10 +22,20 @@
 
 ```ruby
 require 'flipper-mongo`
 ```
 
-**If you need to customize the adapter**, you can add this to an initializer:
+**If you're using Mongoid**, you can add this to an initializer:
+
+```ruby
+Flipper.configure do |config|
+  config.adapter do
+    Flipper::Adapters::Mongo.new(Mongoid.default_client['flipper'])
+  end
+end
+```
+
+Or **if you need to customize the adapter** in any other way, you can add this to an initializer:
 
 ```ruby
 Flipper.configure do |config|
   config.adapter do
     collection = Mongo::Client.new(ENV["MONGO_URL"])["flipper"]