README.md in fluxo-0.2.0 vs README.md in fluxo-0.2.1

@@ -238,9 +238,60 @@
     Success(user)
   end
 end
 ```
 
+### Operation Validation
+
+If you have the `ActiveModel` gem installed, you can use the `validations` method to define validations on the operation.
+
+```ruby
+class SubscribeOperation < Fluxo::Operation(:name, :email)
+  validations do
+    validates :name, presence: true
+    validates :email, presence: true, format: { with: /\A[^@]+@[^@]+\z/ }
+  end
+
+  def call!(name:, email:)
+    # ...
+  end
+end
+```
+
+### Operations Composition
+
+To promote single responsibility principle, Fluxo allows compose a complex operation flow by combining other operations.
+
+```ruby
+class DoubleOperation < Fluxo::Operation(:num)
+  def call!(num:)
+    Success(num: num * 2)
+  end
+end
+
+class SquareOperation < Fluxo::Operation(:num)
+  def call!(num:)
+    Success(num: num * 2)
+  end
+end
+
+class ArithmeticOperation < Fluxo::Operation(:num)
+  flow :normalize, :double, :square
+
+  def normalize(num:)
+    Success(num: num.to_i)
+  end
+
+  def double(num:)
+    DoubleOperation.call(num: num)
+  end
+
+  def square(num:)
+    SquareOperation.call(num: num)
+  end
+end
+```
+
 ### Configuration
 
 ```ruby
 Fluxo.config do |config|
   config.wrap_falsey_result = false