diff --git a/guides/code/getting_started/Gemfile b/guides/code/getting_started/Gemfile
index f5b7b11d3a..5b574cfc1d 100644
--- a/guides/code/getting_started/Gemfile
+++ b/guides/code/getting_started/Gemfile
@@ -21,6 +21,11 @@ gem 'jquery-rails'
 # Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks
 gem 'turbolinks'
 
+group :doc do
+  # bundle exec rake doc:rails generates the API under doc/api.
+  gem 'sdoc'
+end
+
 # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
 gem 'jbuilder', '~> 1.2'
 
diff --git a/railties/lib/rails/generators/rails/app/templates/Gemfile b/railties/lib/rails/generators/rails/app/templates/Gemfile
index f6bd107eba..b3883a94fc 100644
--- a/railties/lib/rails/generators/rails/app/templates/Gemfile
+++ b/railties/lib/rails/generators/rails/app/templates/Gemfile
@@ -9,6 +9,11 @@ source 'https://rubygems.org'
 <%= assets_gemfile_entry %>
 <%= javascript_gemfile_entry -%>
 
+group :doc do
+  # bundle exec rake doc:rails generates the API under doc/api.
+  gem 'sdoc'
+end
+
 # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
 gem 'jbuilder', '~> 1.0.1'
 
diff --git a/railties/railties.gemspec b/railties/railties.gemspec
index a55bf012da..5b0ed90cda 100644
--- a/railties/railties.gemspec
+++ b/railties/railties.gemspec
@@ -28,5 +28,4 @@ Gem::Specification.new do |s|
 
   s.add_dependency 'rake', '>= 0.8.7'
   s.add_dependency 'thor', '>= 0.17.0', '< 2.0'
-  s.add_dependency 'rdoc', '~> 3.4'
 end