README.md in enum_ish-1.4.1 vs README.md in enum_ish-1.5.0

@@ -24,11 +24,11 @@
 
 Extend your class using EnumIsh and define an enum-like field:
 
 ```ruby
 class User
-  extend EnumIsh
+  include EnumIsh::Base
   attr_accessor :status                    # status is a string field
   enum_ish :status, ['enable', 'disable']  # status has 'enable' or 'disable'
 end
 ```
 
@@ -80,11 +80,11 @@
 
 Set default value:
 
 ```ruby
 class User
-  extend EnumIsh
+  include EnumIsh::Base
   attr_accessor :status
   enum_ish :status, ['enable', 'disable'], default: 'enable'
 end
 
 user = User.new
@@ -93,11 +93,11 @@
 
 Use default value with block:
 
 ```ruby
 class User
-  extend EnumIsh
+  include EnumIsh::Base
   attr_accessor :status, :flag
   enum_ish :status, ['enable', 'disable'], default: -> { flag ? 'enable' : 'disable' }
 end
 
 user = User.new
@@ -108,11 +108,11 @@
 
 Generate predicate methods:
 
 ```ruby
 class User
-  extend EnumIsh
+  include EnumIsh::Base
   attr_accessor :status
   enum_ish :status, ['enable', 'disable'], predicate: true
 end
 
 user = User.new
@@ -123,11 +123,11 @@
 
 Without prefix:
 
 ```ruby
 class User
-  extend EnumIsh
+  include EnumIsh::Base
   attr_accessor :status
   enum_ish :status, ['enable', 'disable'], predicate: { prefix: false }
 end
 
 user = User.new
@@ -140,11 +140,11 @@
 
 Generate getter and setter for aliased symbols instead of raw values:
 
 ```ruby
 class User
-  extend EnumIsh
+  include EnumIsh::Base
   attr_accessor :status
   enum_ish :status, { _enable: 'enable', _disable: 'disable' }, accessor: true
 end
 
 user = User.new
@@ -159,11 +159,11 @@
 
 Generate accessor:
 
 ```ruby
 class User < ActiveRecord::Base
-  extend EnumIsh
+  include EnumIsh::Base
   enum_ish :status, { _enable: 'enable', _disable: 'disable' }, accessor: true
 end
 
 User.where(status: :_enable)  #=> SELECT "users".* FROM "users" WHERE "users"."status" = "enable"
 ```
@@ -172,11 +172,11 @@
 
 Generate scope:
 
 ```ruby
 class User < ActiveRecord::Base
-  extend EnumIsh
+  include EnumIsh::Base
   enum_ish :status, ['enable', 'disable'], scope: true
 end
 
 User.with_status(:enable)  #=> SELECT "users".* FROM "users" WHERE "users"."status" = "enable"
 User.with_status_not(:enable)  #=> SELECT "users".* FROM "users" WHERE "users"."status" != 'enable'
@@ -186,17 +186,28 @@
 
 Generate validation:
 
 ```ruby
 class User < ActiveRecord::Base
-  extend EnumIsh
+  include EnumIsh::Base
   enum_ish :status, ['enable', 'disable'], validate: true
 end
 
 user = User.new
 user.status = 'INVALID'
 user.valid?  #=> false
 ```
+
+### Dictionary cache
+
+You can enable dictionary cache using rack middleware:
+
+```ruby
+Rails.application.config.middleware.use EnumIsh::DictionaryCache
+```
+
+This middleware enables dictionary cache for each request.
+Prformance of dictionary lookup will be improved in case one dictionary is used repeatedly in the same request.
 
 ## Contributing
 
 Bug reports and pull requests are welcome at https://github.com/kanety/enum_ish.