7 files changed, 13 insertions, 0 deletions
diff --git a/guides/rails_guides/generator.rb b/guides/rails_guides/generator.rb
index 35f014747c..7205f37be7 100644
--- a/guides/rails_guides/generator.rb
+++ b/guides/rails_guides/generator.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "set"
 require "fileutils"
 
diff --git a/guides/rails_guides/helpers.rb b/guides/rails_guides/helpers.rb
index 520aa7f7cc..a6970fb90c 100644
--- a/guides/rails_guides/helpers.rb
+++ b/guides/rails_guides/helpers.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "yaml"
 
 module RailsGuides
diff --git a/guides/rails_guides/indexer.rb b/guides/rails_guides/indexer.rb
index c58b6b85a2..c707464cdf 100644
--- a/guides/rails_guides/indexer.rb
+++ b/guides/rails_guides/indexer.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "active_support/core_ext/object/blank"
 require "active_support/core_ext/string/inflections"
 
diff --git a/guides/rails_guides/kindle.rb b/guides/rails_guides/kindle.rb
index 9536d0bd3b..87a369a15a 100644
--- a/guides/rails_guides/kindle.rb
+++ b/guides/rails_guides/kindle.rb
@@ -1,4 +1,5 @@
 #!/usr/bin/env ruby
+# frozen_string_literal: true
 
 require "kindlerb"
 require "nokogiri"
diff --git a/guides/rails_guides/levenshtein.rb b/guides/rails_guides/levenshtein.rb
index 40c6a5c372..bafa6bfe9d 100644
--- a/guides/rails_guides/levenshtein.rb
+++ b/guides/rails_guides/levenshtein.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module RailsGuides
   module Levenshtein
     # This code is based directly on the Text gem implementation.
diff --git a/guides/rails_guides/markdown.rb b/guides/rails_guides/markdown.rb
index 02d58601c4..84f95eec68 100644
--- a/guides/rails_guides/markdown.rb
+++ b/guides/rails_guides/markdown.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "redcarpet"
 require "nokogiri"
 require "rails_guides/markdown/renderer"
diff --git a/guides/rails_guides/markdown/renderer.rb b/guides/rails_guides/markdown/renderer.rb
index 7ac3d417a4..1f2fe91ea1 100644
--- a/guides/rails_guides/markdown/renderer.rb
+++ b/guides/rails_guides/markdown/renderer.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module RailsGuides
   class Markdown
     class Renderer < Redcarpet::Render::HTML