diff --git a/Rules b/Rules
index 8d91a27..a54613c 100644
--- a/Rules
+++ b/Rules
@@ -12,7 +12,7 @@ require "nanoc-tidy"
 
 ##
 # Extensions
-[Nanoc::RuleDSL::CompilationRuleContext, Nanoc::RuleDSL::CompilerDSL].each { _1.prepend(Mixin) }
+[Nanoc::RuleDSL::CompilationRuleContext, Nanoc::RuleDSL::CompilerDSL].each { _1.prepend(Utils) }
 Nanoc::RuleDSL::CompilationRuleContext.prepend(Nanoc::Extension::AnonymousFilter)
 Nanoc::RuleDSL::CompilerDSL.prepend(Nanoc::Extension::RequireRules)
 
diff --git a/nanoc/lib/mixin.rb b/nanoc/lib/utils.rb
similarity index 83%
rename from nanoc/lib/mixin.rb
rename to nanoc/lib/utils.rb
index 5fde7b8..2a9ae9d 100644
--- a/nanoc/lib/mixin.rb
+++ b/nanoc/lib/utils.rb
@@ -1,11 +1,15 @@
 # frozen_string_literal: true
 
-module Mixin
+##
+# The {Utils Utils} module provides methods that are
+# available at build time. Both ERB templates and the
+# Rules file have access to the methods of this module.
+module Utils
   require "test-cmd"
-  require_relative "mixin/t"
-  require_relative "mixin/inline"
-  require_relative "mixin/erb"
-  require_relative "mixin/opengraph"
+  require_relative "utils/t"
+  require_relative "utils/inline"
+  require_relative "utils/erb"
+  require_relative "utils/opengraph"
 
   ##
   # @return [Ryo::Object]
@@ -74,4 +78,4 @@ module Mixin
   include ERB
   include OpenGraph
 end
-use_helper Mixin
+use_helper Utils
diff --git a/nanoc/lib/mixin/erb.rb b/nanoc/lib/utils/erb.rb
similarity index 85%
rename from nanoc/lib/mixin/erb.rb
rename to nanoc/lib/utils/erb.rb
index f39b4e4..28f688a 100644
--- a/nanoc/lib/mixin/erb.rb
+++ b/nanoc/lib/utils/erb.rb
@@ -1,9 +1,9 @@
 # frozen_string_literal: true
 
 ##
-# The {Mixin::ERB Mixin::ERB} module provides a method
+# The {Utils::ERB Utils::ERB} module provides a method
 # that can render an ERB template
-module Mixin::ERB
+module Utils::ERB
   ##
   # @param [String] file
   #  The path to an ERB template
diff --git a/nanoc/lib/mixin/inline.rb b/nanoc/lib/utils/inline.rb
similarity index 95%
rename from nanoc/lib/mixin/inline.rb
rename to nanoc/lib/utils/inline.rb
index 9cd63a8..8cad7a7 100644
--- a/nanoc/lib/mixin/inline.rb
+++ b/nanoc/lib/utils/inline.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-module Mixin::Inline
+module Utils::Inline
   def inline_json(path, class_name: File.basename(path, File.extname(path)))
     %|<script class="json #{class_name}" type="application/json">| \
     "#{items[path].compiled_content}" \
diff --git a/nanoc/lib/mixin/opengraph.rb b/nanoc/lib/utils/opengraph.rb
similarity index 97%
rename from nanoc/lib/mixin/opengraph.rb
rename to nanoc/lib/utils/opengraph.rb
index 31624bf..e58ef48 100644
--- a/nanoc/lib/mixin/opengraph.rb
+++ b/nanoc/lib/utils/opengraph.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-module Mixin::OpenGraph
+module Utils::OpenGraph
   def opengraph(context)
     erb "_opengraph.html.erb", local_assigns(context)
   end
diff --git a/nanoc/lib/mixin/t.rb b/nanoc/lib/utils/t.rb
similarity index 88%
rename from nanoc/lib/mixin/t.rb
rename to nanoc/lib/utils/t.rb
index e5437d4..af6a306 100644
--- a/nanoc/lib/mixin/t.rb
+++ b/nanoc/lib/utils/t.rb
@@ -1,10 +1,10 @@
 # frozen_string_literal: true
 
 ##
-# The {Mixin::T Mixin::T} module provides a method that
+# The {Utils::T Utils::T} module provides a method that
 # can render user-facing text strings in different
 # locales / languages
-module Mixin::T
+module Utils::T
   ##
   # @param [String] locale
   #  Locale (eg "en")