README.md in csv_row_model-0.2.1 vs README.md in csv_row_model-0.3.0

@@ -287,11 +287,11 @@
   presenter do
     # define your presenter here
 
     # this is shorthand for the psuedo_code:
     # def project
-    #  return if row_model.id.invalid? || row_model.name.invalid?
+    #  return if row_model.id.blank? || row_model.name.blank?
     #
     #  # turn off memoziation with `memoize: false` option
     #  @project ||= __the_code_inside_the_block__
     # end
     #
@@ -326,13 +326,13 @@
 
 Also, the `attribute` defines a dynamic `#project` method that:
 
 1. Memoizes by default, turn off with `memoize: false` option
 2. All errors of `row_model` are propagated to the presenter when calling `presenter.valid?`
-3. Handles dependencies. When any of the dependencies are `invalid?`:
-  - The attribute block is not called and the attribute returns `nil`.
-  - `presenter.errors` for dependencies are cleaned. For the example above, if `row_model.id/name` are `invalid?`, then
+3. Handles dependencies:
+  - When any of the dependencies are `blank?`, the attribute block is not called and the attribute returns `nil`.
+  - When any of the dependencies are `invalid?`, `presenter.errors` for dependencies are cleaned. For the example above, if `row_model.id/name` are `invalid?`, then
 the `:project` key is removed from the errors, so: `presenter.errors.keys # => [:id, :name]`
 
 ## Import Validations
 
 Use [`ActiveModel::Validations`](http://api.rubyonrails.org/classes/ActiveModel/Validations.html) the `RowModel`'s [Layers](#layers).
@@ -438,11 +438,12 @@
 class DynamicColumnModel
   include CsvRowModel::Model
 
   column :first_name
   column :last_name
-  dynamic_column :skills
+  # header is optional, below is the default_implementation
+  dynamic_column :skills, header: ->(skill_name) { skill_name } 
 end
 ```
 
 represents this table:
 
@@ -462,16 +463,9 @@
   include CsvRowModel::Export
 
   def skill(skill_name)
     # below is an override, this is the default implementation: skill_name # => "skill1", then "skill2"
     source_model.skills.include?(skill_name) ? "Yes" : "No"
-  end
-
-  class << self
-    # this is an override with the default implementation
-    def skill_header(skill_name)
-      skill_name
-    end
   end
 end
 
 # the `skills` context is mapped to generate an array
 export_file = CsvRowModel::Export::File.new(DynamicColumnExportModel, { skills: Skill.all  })
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