README.md in sunzi-rails-0.2.11 vs README.md in sunzi-rails-0.2.12

- old
+ new

@@ -58,9 +58,20 @@
 
 Finally, add `/compiled` to your `.gitignore` file.
 
 All those settings can be overriden in your `sunzi.yml` file within `attributes`.
 
+Also, contextual attributes are available through `@attributes`:
+
+```ruby
+@attributes.env_stage
+@attributes.env_role
+@attributes.env_sudo
+@attributes.env_user
+@attributes.env_host
+@attributes.env_port
+```
+
 Go into the project directory, then run `sunzi-cap deploy`:
 
 ```bash
 $ sunzi-cap deploy staging admin --sudo
 $ sunzi-cap deploy staging deployer