diff --git a/Gemfile b/Gemfile
new file mode 100644
index 0000000..851fabc
--- /dev/null
+++ b/Gemfile
@@ -0,0 +1,2 @@
+source 'https://rubygems.org'
+gemspec
diff --git a/asciidoctor-foodogsquared-extensions.gemspec b/asciidoctor-foodogsquared-extensions.gemspec
index 853ca0a..e4befef 100644
--- a/asciidoctor-foodogsquared-extensions.gemspec
+++ b/asciidoctor-foodogsquared-extensions.gemspec
@@ -3,17 +3,17 @@ Gem::Specification.new do |s|
   s.version       = '1.0.0'
   s.licenses      = ['MIT']
   s.summary       = "foo-dogsquared's custom Asciidoctor extensions"
-  s.description   = <<-EOF
+  s.description   = <<-DESC
     foo-dogsquared's custom Asciidoctor extensions as a Gem. This is not meant
     to be used in production or as a public Gem. This is used since Hugo
     doesn't allow loading Asciidoctor extensions with path separators.
-  EOF
+  DESC
 
-  s.authors       = ["Gabriel Arazas"]
-  s.email         = "foodogsquared@foodogsquared.one"
-  s.metadata      = { "source_code_uri" => "https://github.com/foo-dogsquared/foo-dogsquared.github.io" }
+  s.authors       = ['Gabriel Arazas']
+  s.email         = 'foodogsquared@foodogsquared.one'
+  s.metadata      = { 'source_code_uri' => 'https://github.com/foo-dogsquared/foo-dogsquared.github.io' }
 
-  s.files         = Dir["lib/**/*", "*.gemspec"]
+  s.files         = Dir['lib/**/*', '*.gemspec']
 
   s.add_runtime_dependency 'asciidoctor', '~> 2.0'
 end