diff --git a/lib/shoulda/matchers.rb b/lib/shoulda/matchers.rb
index b4c00d1e5..72ee0f687 100644
--- a/lib/shoulda/matchers.rb
+++ b/lib/shoulda/matchers.rb
@@ -14,8 +14,8 @@
 require 'shoulda/matchers/active_record'
 require 'shoulda/matchers/routing'
 
-module Shoulda
-  module Matchers
+module Shoulda # :nodoc:
+  module Matchers # :nodoc:
     class << self
       # @private
       attr_accessor :assertion_exception_class
diff --git a/lib/shoulda/matchers/active_model/validate_inclusion_of_matcher.rb b/lib/shoulda/matchers/active_model/validate_inclusion_of_matcher.rb
index 4eae81f73..785bd504e 100644
--- a/lib/shoulda/matchers/active_model/validate_inclusion_of_matcher.rb
+++ b/lib/shoulda/matchers/active_model/validate_inclusion_of_matcher.rb
@@ -3,6 +3,7 @@
 
 module Shoulda
   module Matchers
+    # @private
     class ExampleClass; end
 
     module ActiveModel
diff --git a/lib/shoulda/matchers/rails_shim.rb b/lib/shoulda/matchers/rails_shim.rb
index 63e08eb10..f91fc7e53 100644
--- a/lib/shoulda/matchers/rails_shim.rb
+++ b/lib/shoulda/matchers/rails_shim.rb
@@ -177,6 +177,7 @@ def simply_generate_validation_message(
           I18n.translate(primary_translation_key, translate_options)
         end
 
+        # @private
         class FakeAttributeType
           def initialize(model, attribute_name)
             @model = model