README.md in defekt-0.0.3 vs README.md in defekt-0.0.4

@@ -48,18 +48,44 @@
   def test_name
     equal_to! 'kodnin', @person.name
   end
 
   def test_age
-    true! !@person.respond_to?(:age)
+    not_respond_to! @person, :age
     @person.stub(:age, 'unknown') do
-      true! @person.respond_to?(:age)
+      respond_to! @person, :age
       equal_to! 'unknown', @person.age
     end
   end
 end
 
 Defekt.run
+```
+
+## Assertions
+
+All available assertions have negative counterparts prefixed with `not_`.
+
+- true!
+- equal_to!
+- identical_to!
+- included_in!
+- instance_of!
+- kind_of!
+- respond_to!
+
+You can add your own assertions by opening up the `Defekt::Assertions` module.
+
+```ruby
+module Defekt
+  module Assertions
+    def awesome!(value)
+      unless value == 'awesome'
+        raise Errors::AwesomeError, "~#{value}~ is not awesome"
+      end
+    end
+  end
+end
 ```
 
 ## Development
 
 After checking out the repo, run `bin/setup` to install dependencies. Then, run `bin/console` for an interactive prompt that will allow you to experiment.