diff --git a/.gitignore b/.gitignore
index 162ed15..c279e7a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,3 +16,4 @@ spec/reports
 test/tmp
 test/version_tmp
 tmp
+.idea/
\ No newline at end of file
diff --git a/lib/oat/adapters/siren.rb b/lib/oat/adapters/siren.rb
index be4cc03..697ca0d 100644
--- a/lib/oat/adapters/siren.rb
+++ b/lib/oat/adapters/siren.rb
@@ -1,8 +1,9 @@
+# frozen_string_literal: true
+
 # https://github.com/kevinswiber/siren
 module Oat
   module Adapters
     class Siren < Oat::Adapter
-
       def initialize(*args)
         super
         data[:links] = []
@@ -12,17 +13,21 @@ def initialize(*args)
 
       # Sub-Entities have a required rel attribute
       # https://github.com/kevinswiber/siren#rel
-      def rel(rels)
+      def rel(*rels)
         # rel must be an array.
         data[:rel] = Array(rels)
       end
 
       def type(*types)
-        data[:class] = types
+        data[:class] = Array(types)
+      end
+
+      def title(title)
+        data[:title] = title
       end
 
       def link(rel, opts = {})
-        data[:links] << {:rel => [rel].flatten}.merge(opts)
+        data[:links] << { rel: Array(rel) }.merge(opts)
       end
 
       def properties(&block)
@@ -33,7 +38,7 @@ def property(key, value)
         data[:properties][key] = value
       end
 
-      alias_method :meta, :property
+      alias meta property
 
       def entity(name, obj, serializer_class = nil, context_options = {}, &block)
         ent = serializer_from_block_or_class(obj, serializer_class, context_options, &block)
@@ -42,9 +47,7 @@ def entity(name, obj, serializer_class = nil, context_options = {}, &block)
           ent.rel(name)
           ent_hash = ent.to_hash
 
-          unless data[:entities].include? ent_hash
-            data[:entities] << ent_hash
-          end
+          data[:entities] << ent_hash
         end
       end
 
@@ -54,11 +57,11 @@ def entities(name, collection, serializer_class = nil, context_options = {}, &bl
         end
       end
 
-      alias_method :collection, :entities
+      alias collection entities
 
-      def action(name, &block)
+      def action(name)
         action = Action.new(name)
-        block.call(action)
+        yield(action)
 
         data[:actions] << action.data
       end
@@ -67,21 +70,21 @@ class Action
         attr_reader :data
 
         def initialize(name)
-          @data = { :name => name, :class => [], :fields => [] }
+          @data = { name: name, class: [], fields: [] }
         end
 
         def klass(value)
-          data[:class] << value
+          data[:class].concat(Array(value))
         end
 
-        def field(name, &block)
+        def field(name)
           field = Field.new(name)
-          block.call(field)
+          yield(field)
 
           data[:fields] << field.data
         end
 
-        %w(href method title type).each do |attribute|
+        %w[categories href method title type].each do |attribute|
           define_method(attribute) do |value|
             data[attribute.to_sym] = value
           end
@@ -91,21 +94,20 @@ class Field
           attr_reader :data
 
           def initialize(name)
-            @data = { :name => name, :class => []}
+            @data = { name: name, class: [] }
           end
 
           def klass(value)
-            data[:class] << value
+            data[:class].concat(Array(value))
           end
 
-          %w(type value title).each do |attribute|
+          %w[category type value title].each do |attribute|
             define_method(attribute) do |value|
               data[attribute.to_sym] = value
             end
           end
         end
       end
-
     end
   end
 end
diff --git a/spec/adapters/siren_spec.rb b/spec/adapters/siren_spec.rb
index 3000aaf..38f6a34 100644
--- a/spec/adapters/siren_spec.rb
+++ b/spec/adapters/siren_spec.rb
@@ -12,6 +12,8 @@
     it 'produces a Siren-compliant hash' do
       expect(hash.fetch(:class)).to match_array(['user'])
 
+      expect(hash.fetch(:title)).to eq('This guy')
+
       expect(hash.fetch(:properties)).to include(
         :id => user.id,
         :name => user.name,
diff --git a/spec/fixtures.rb b/spec/fixtures.rb
index 1c6bbad..f9879a7 100644
--- a/spec/fixtures.rb
+++ b/spec/fixtures.rb
@@ -38,6 +38,10 @@ def self.included(base)
             entities [:friends, 'http://example.org/rels/person'], item.friends, klass, :message => "Merged into parent's context"
           end
 
+          if adapter.respond_to?(:title)
+            title 'This guy'
+          end
+
           if adapter.respond_to?(:action)
             action :close_account do |action|
               action.href "http://foo.bar.com/#{item.id}/close_account"