diff --git a/.gitignore b/.gitignore
index de5eb49..e79999b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,6 +3,7 @@
 /_yardoc/
 /coverage/
 /doc/
+/docs
 /pkg/
 /spec/reports/
 /tmp/
@@ -11,3 +12,5 @@
 .rspec_status
 
 *.gem
+
+.DS_store
diff --git a/.rubocop.yml b/.rubocop.yml
index 4c5ed9b..f6acb7f 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -4,6 +4,9 @@ require:
 AllCops:
     NewCops: enable
 
+Naming/BlockForwarding:
+  EnforcedStyle: explicit
+
 Style/StringLiterals:
   Enabled: true
   EnforcedStyle: double_quotes
diff --git a/Gemfile b/Gemfile
index 3a1d2c3..0837c85 100644
--- a/Gemfile
+++ b/Gemfile
@@ -11,3 +11,5 @@ gem "rake", "~> 13.0"
 gem "rspec", "~> 3.0"
 gem "rubocop", "~> 1.21"
 gem "rubocop-rspec", "~> 2.22.0", require: false
+# Documentation tool
+gem "yard"
diff --git a/Gemfile.lock b/Gemfile.lock
index 3f46812..55109b5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -56,6 +56,7 @@ GEM
       rubocop-factory_bot (~> 2.22)
     ruby-progressbar (1.11.0)
     unicode-display_width (2.4.2)
+    yard (0.9.34)
 
 PLATFORMS
   ruby
@@ -68,6 +69,7 @@ DEPENDENCIES
   rubocop (~> 1.21)
   rubocop-rspec (~> 2.22.0)
   slither!
+  yard
 
 BUNDLED WITH
    2.3.25
diff --git a/README.md b/README.md
index a0421ce..a1d566e 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,8 @@
 # Slither
 by Ryan Wood http://ryanwood.com
 
+Documentation: https://www.rubydoc.info/gems/slither
+
 # Description:
 
 A simple, clean DSL for describing, writing, and parsing fixed-width text files.
diff --git a/lib/slither/definition.rb b/lib/slither/definition.rb
index ee343df..adb0e07 100644
--- a/lib/slither/definition.rb
+++ b/lib/slither/definition.rb
@@ -1,48 +1,96 @@
-module Slither
-  class Definition
-    attr_reader :sections, :templates, :options
-
-    def initialize(options = {})
-      @sections = []
-      @templates = {}
-      @options = { :align => :right, :by_bytes => true }.merge(options)
-    end
-
-    def section(name, options = {}, &block)
-      if section_using_reserved_name?(name) || section_already_defined?(name)
-        raise( ArgumentError, "Reserved or duplicate section name: '#{name}'")
-      end
-
-      section = Slither::Section.new(name, @options.merge(options))
-      section.definition = self
-
-      yield(section)
-
-      sections << section
-      section
-    end
-
-    def template(name, options = {}, &block)
-      section = Slither::Section.new(name, @options.merge(options))
-      yield(section)
-      @templates[name] = section
-    end
-
-    def method_missing(method, *args, &block)
-      section(method, *args, &block)
-    end
-
-    private
-
-    def section_using_reserved_name?(name)
-      Section::RESERVED_NAMES.include?(name)
-    end
-
-    def section_already_defined?(name)
-      return false if sections.empty?
-
-      section_names = sections.map(&:name)
-      section_names.include?(name)
-    end
-  end
-end
+# frozen_string_literal: true
+
+module Slither
+  # A Definition is the parent object that contains the information about how a fixed-width file is
+  # formatted. It contains a collection of sections, each of which contains a collection of fields.
+  class Definition
+    attr_reader :sections, :templates, :options
+
+    # Initializes a new Definition object.
+    #
+    # @param options [Hash] An optional hash of configuration options.
+    # @option options [Symbol] :align ( :right ) The alignment for fields, can be :left, :right, or :center.
+    # @option options [Boolean] :by_bytes ( true ) Whether to align fields by bytes or characters.
+    #
+    def initialize(options = {})
+      @sections = []
+      @templates = {}
+      @options = { align: :right, by_bytes: true }.merge(options)
+    end
+
+    # Defines a new Section within the Definition.
+    #
+    # @param name [String] The name of the section.
+    # @param options [Hash] An optional hash of section-specific configuration options.
+    # @yield [Section] A block for defining fields within the section.
+    # @yieldparam section [Section] The section object to be configured.
+    # @return [Section] The newly created section.
+    #
+    # @raise [ArgumentError] if the section name is reserved or already defined.
+    #
+    # @example Define a section for the "header" part of the fixed-width file.
+    #   definition.section(:header, align: :left) do |section|
+    #     # The trap tells Slither which lines should fall into this section
+    #     section.trap { |line| line[0,4] == 'HEAD' }
+    #     # Use the boundary template for the columns
+    #     section.template(:boundary)
+    #   end
+    #
+    def section(name, options = {}, &block)
+      if section_using_reserved_name?(name) || section_already_defined?(name)
+        raise ArgumentError, "Reserved or duplicate section name: '#{name}'"
+      end
+
+      section = Slither::Section.new(name, @options.merge(options))
+      section.definition = self
+
+      yield(section) if block
+
+      sections << section
+      section
+    end
+
+    # Defines a template, which can be reused to create multiple sections with the same configuration.
+    #
+    # @param name [String] The name of the template.
+    # @param options [Hash] An optional hash of template-specific configuration options.
+    # @yield [section] A block for configuring the template.
+    # @yieldparam section [Section] The template object to be configured.
+    #
+    # @example Define a template for the "boundary" part of the fixed-width file.
+    #   definition.template(:boundary) do |section|
+    #     section.column(:record_type, 4)
+    #     section.column(::company_id, 12)
+    #
+    def template(name, options = {}, &block)
+      section = Slither::Section.new(name, @options.merge(options))
+      yield(section) if block
+      @templates[name] = section
+    end
+
+    # Provides a way to define sections using method calls. For example,
+    #  you can call `my_section` instead of `section('my_section')`.
+    #
+    # @param method [Symbol] The name of the section.
+    # @param args [Array] Additional arguments.
+    # @param block [Block] A block for defining fields within the section.
+    # @return [Section] The newly created section.
+    #
+    def method_missing(method, *args, &block) # rubocop:disable Style/MissingRespondToMissing
+      section(method, *args, &block)
+    end
+
+    private
+
+    def section_using_reserved_name?(name)
+      Section::RESERVED_NAMES.include?(name)
+    end
+
+    def section_already_defined?(name)
+      return false if sections.empty?
+
+      section_names = sections.map(&:name)
+      section_names.include?(name)
+    end
+  end
+end
diff --git a/spec/slither/definition_spec.rb b/spec/slither/definition_spec.rb
index 5cd8602..3243d67 100644
--- a/spec/slither/definition_spec.rb
+++ b/spec/slither/definition_spec.rb
@@ -20,8 +20,9 @@
       subject { described_class.new }
 
       it "defaults to :right if is not specified" do
-        subject.section("name") do
-          # Empty block
+        subject.section("name") do |section|
+          section.column(:id, 10)
+          section.column(:name, 20)
         end
 
         section = subject.sections.first