README.md in atacama-0.1.4 vs README.md in atacama-0.1.5

@@ -28,10 +28,11 @@
 The basic object is `Contract`. It enforces type contracts by utilizing `dry-types`.
 
 ```
 class UserFetcher < Atacama::Contract
   option :id, Types::Strict::Number.gt(0)
+  returns Types.Instance(User)
 
   def call
     User.find(id)
   end
 end
@@ -43,10 +44,11 @@
 of changes to execute.
 
 ```
 class UserFetcher < Atacama::Step
   option :id, type: Types::Strict::Number.gt(0)
+  returns Types.Option(model: Types.Instance(User))
 
   def call
     Option(model: User.find(id))
   end
 end
@@ -58,11 +60,13 @@
     $redis.avg('duration', Time.now - start)
   end
 end
 
 class UpdateUser < Atacama::Transformer
-  option :model, type: Types::Instance(User)
+  option :model, type: Types.Instance(User)
   option :attributes, type: Types::Strict::Hash
+
+  returns_option :model, Types.Instance(User)
 
   step :duration, with: Duration do
     step :find, with: UserFetcher
     step :save
   end