Readme.md in optimizely_server_side-0.0.9 vs Readme.md in optimizely_server_side-0.0.10

@@ -56,19 +56,24 @@
   config.event_dispatcher = MyEventDispatcher.new
 end
 
 ```
 
-Config info
+_Config info_
 
-`config_endpoint` - This is the Datafile endpoint which returns JSON config. `PROJECT_ID` is a id of your  server side project at https://app.optimizely.com .
-`cache_expiry` - Time we want to keep the config cached in memory.
-`event_dispatcher` - Optimizely needs to track every visit. You can pass your own event dispatcher from here. Read [more](https://developers.optimizely.com/server/reference/index#event-dispatcher)
+- `config_endpoint` - This is the Datafile endpoint which returns JSON config. `PROJECT_ID` is a id of your  server side project at https://app.optimizely.com .
+- `cache_expiry` - Time we want to keep the config cached in memory.
+- `event_dispatcher` - Optimizely needs to track every visit. You can pass your own event dispatcher from here. Read [more](https://developers.optimizely.com/server/reference/index#event-dispatcher)
+- `user_attributes` - Everything related to user is passed from here. The must have key is `visitor_id`. In the same hash you can pass other other custom attributes. eq
 
+```
+config.user_attributes = {'visitor_id' => 1234, 'device_type' => 'iPhone'}
+```
 
 
 
+
 Optimizely needs a `visitor_id` to track the unique user and server a constant experience.  
 
 In your Application controller
 
 ```ruby
@@ -82,11 +87,11 @@
     cookies.permanent[:visitor_id] = '1234567' #some visitor_id
 
     # This links the browser cookie for visitor_id to
     # OptimizelyServerSide
     OptimizelyServerSide.configure do |config|  
-        config.visitor_id = cookies[:visitor_id]
+        config.user_attributes = {'visitor_id' => cookies[:visitor_id]}
     end
   end
 
 ```
 
@@ -97,17 +102,17 @@
 ```ruby
 # in any app/view/foo.html.erb
 <% experiment(EXPERIMENT_KEY) do |config| %>
 
   <% config.variation_one(VARIATION_ONE_KEY) do %>
-    <%= render partial: 'variation_one_experience' %> 
+    <%= render partial: 'variation_one_experience' %>
   <% end %>
 
   <% config.variation_default(VARIATION_DEFAULT_KEY, primary: true) do %>
     <%= render partial: 'variation_default_experience' %>
   <% end %>
-  
+
 <% end %>
 ```
 
 #### In your model or any PORO
 
@@ -149,10 +154,10 @@
   <% end %>
 
   <% config.variation_pathetic_experience(VARIATION_DEFAULT_KEY, primary: true) do %>
     <%= render partial: 'variation_default_experience' %>
   <% end %>
-  
+
 <% end %>
 
 ```
 In the above examples: