diff --git a/NEWS.md b/NEWS.md
index 3a37d605..289288ba 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -19,7 +19,7 @@
     include the gem as normal.
   * You'll need to add the following somewhere in your `rails_helper` (for
     RSpec) or `test_helper` (for Minitest / Test::Unit):
-  
+
     ``` ruby
     Shoulda::Matchers.configure do |config|
       config.integrate do |with|
@@ -29,11 +29,11 @@
         with.test_framework :minitest_4
         with.test_framework :test_unit
 
-        # Choose a library:
+        # Choose one or more libraries:
         with.library :active_record
         with.library :active_model
         with.library :action_controller
-        # Or, choose all of the above:
+        # Or, choose the following (which implies all of the above):
         with.library :rails
       end
     end
diff --git a/README.md b/README.md
index ba65c148..6af05905 100644
--- a/README.md
+++ b/README.md
@@ -165,11 +165,11 @@ Shoulda::Matchers.configure do |config|
     with.test_framework :minitest_4
     with.test_framework :test_unit
 
-    # Choose a library:
+    # Choose one or more libraries:
     with.library :active_record
     with.library :active_model
     with.library :action_controller
-    # Or, choose all of the above:
+    # Or, choose the following (which implies all of the above):
     with.library :rails
   end
 end
diff --git a/lib/shoulda/matchers/integrations/configuration.rb b/lib/shoulda/matchers/integrations/configuration.rb
index dd504f8f..b7179bf3 100644
--- a/lib/shoulda/matchers/integrations/configuration.rb
+++ b/lib/shoulda/matchers/integrations/configuration.rb
@@ -11,6 +11,7 @@ module Shoulda
 
         def initialize(configuration, &block)
           @test_frameworks = Set.new
+          @libraries = Set.new
 
           test_framework :missing_test_framework
           library :missing_library
@@ -24,14 +25,14 @@ module Shoulda
         end
 
         def library(name)
-          @library = Integrations.find_library!(name)
+          @libraries << Integrations.find_library!(name)
         end
 
         def apply
-          if no_test_frameworks_added? && library_not_set?
+          if no_test_frameworks_added? && no_libraries_added?
             raise ConfigurationError, <<EOT
-shoulda-matchers is not configured correctly. You need to specify a test
-framework and/or library. For example:
+shoulda-matchers is not configured correctly. You need to specify at least one
+test framework and/or library. For example:
 
 Shoulda::Matchers.configure do |config|
   config.integrate do |with|
@@ -44,7 +45,7 @@ EOT
 
           @test_frameworks.each do |test_framework|
             test_framework.include(Shoulda::Matchers::Independent)
-            @library.integrate_with(test_framework)
+            @libraries.each { |library| library.integrate_with(test_framework) }
           end
         end
 
@@ -58,8 +59,8 @@ EOT
           @test_frameworks.empty? || !@test_frameworks.any?(&:present?)
         end
 
-        def library_not_set?
-          @library.nil?
+        def no_libraries_added?
+          @libraries.empty?
         end
       end
     end
diff --git a/spec/acceptance/active_model_integration_spec.rb b/spec/acceptance/active_model_integration_spec.rb
index a23d5125..1c9042e9 100644
--- a/spec/acceptance/active_model_integration_spec.rb
+++ b/spec/acceptance/active_model_integration_spec.rb
@@ -6,7 +6,7 @@ describe 'shoulda-matchers integrates with an ActiveModel project' do
 
     add_shoulda_matchers_to_project(
       test_frameworks: [:rspec],
-      library: :active_model
+      libraries: [:active_model]
     )
 
     write_file 'load_dependencies.rb', <<-FILE
diff --git a/spec/acceptance/multiple_libraries_integration_spec.rb b/spec/acceptance/multiple_libraries_integration_spec.rb
new file mode 100644
index 00000000..5284142e
--- /dev/null
+++ b/spec/acceptance/multiple_libraries_integration_spec.rb
@@ -0,0 +1,52 @@
+require 'acceptance_spec_helper'
+
+describe 'shoulda-matchers integrates with multiple libraries' do
+  before do
+    create_rails_application
+
+    write_file 'db/migrate/1_create_users.rb', <<-FILE
+      class CreateUsers < ActiveRecord::Migration
+        def self.up
+          create_table :users do |t|
+            t.string :name
+          end
+        end
+      end
+    FILE
+
+    run_rake_tasks!(*%w(db:drop db:create db:migrate))
+
+    write_file 'app/models/user.rb', <<-FILE
+      class User < ActiveRecord::Base
+        validates_presence_of :name
+        validates_uniqueness_of :name
+      end
+    FILE
+
+    add_rspec_file 'spec/models/user_spec.rb', <<-FILE
+      describe User do
+        it { should validate_presence_of(:name) }
+        it { should validate_uniqueness_of(:name) }
+      end
+    FILE
+
+    updating_bundle do
+      add_rspec_rails_to_project!
+      add_shoulda_matchers_to_project(
+        test_frameworks: [:rspec],
+        libraries: [:active_record, :active_model]
+      )
+    end
+  end
+
+  context 'when using both active_record and active_model libraries' do
+    it 'allows the use of matchers from both libraries' do
+      result = run_rspec_suite
+      expect(result).to have_output('2 examples, 0 failures')
+      expect(result).to have_output('should require name to be set')
+      expect(result).to have_output(
+        'should require case sensitive unique value for name'
+      )
+    end
+  end
+end
diff --git a/spec/acceptance/rails_integration_spec.rb b/spec/acceptance/rails_integration_spec.rb
index 2d44fbb3..92398736 100644
--- a/spec/acceptance/rails_integration_spec.rb
+++ b/spec/acceptance/rails_integration_spec.rb
@@ -14,7 +14,7 @@ describe 'shoulda-matchers integrates with Rails' do
       end
     FILE
 
-    run_rake_tasks! *%w(db:drop db:create db:migrate)
+    run_rake_tasks!(*%w(db:drop db:create db:migrate))
 
     write_file 'app/models/user.rb', <<-FILE
       class User < ActiveRecord::Base
@@ -39,7 +39,7 @@ describe 'shoulda-matchers integrates with Rails' do
       add_gems_for_n_unit
       add_shoulda_matchers_to_project(
         test_frameworks: [default_test_framework],
-        library: :rails
+        libraries: [:rails]
       )
     end
 
@@ -51,7 +51,7 @@ describe 'shoulda-matchers integrates with Rails' do
       add_gems_for_rspec
       add_shoulda_matchers_to_project(
         test_frameworks: [:rspec],
-        library: :rails
+        libraries: [:rails]
       )
     end
 
@@ -68,7 +68,7 @@ describe 'shoulda-matchers integrates with Rails' do
       add_gems_for_rspec
       add_shoulda_matchers_to_project(
         test_frameworks: [:rspec],
-        library: :rails,
+        libraries: [:rails],
         manually: true
       )
     end
@@ -84,7 +84,7 @@ describe 'shoulda-matchers integrates with Rails' do
       add_gems_for_rspec
       add_shoulda_matchers_to_project(
         test_frameworks: [:rspec, nil],
-        library: :rails
+        libraries: [:rails]
       )
     end
 
diff --git a/spec/support/acceptance/adds_shoulda_matchers_to_project.rb b/spec/support/acceptance/adds_shoulda_matchers_to_project.rb
index 891f4b79..6a1663f8 100644
--- a/spec/support/acceptance/adds_shoulda_matchers_to_project.rb
+++ b/spec/support/acceptance/adds_shoulda_matchers_to_project.rb
@@ -47,15 +47,15 @@ module AcceptanceTests
 
     def each_test_helper_file
       options[:test_frameworks].each do |test_framework|
-        library = options[:library]
-        test_helper_file = test_helper_file_for(test_framework, library)
-        yield test_helper_file, test_framework, library
+        libraries = options.fetch(:libraries, [])
+        test_helper_file = test_helper_file_for(test_framework, libraries)
+        yield test_helper_file, test_framework, libraries
       end
     end
 
-    def add_configuration_block_to(test_helper_file, test_framework, library)
+    def add_configuration_block_to(test_helper_file, test_framework, libraries)
       test_framework_config = test_framework_config_for(test_framework)
-      library_config = library_config_for(library)
+      library_config = library_config_for(libraries)
 
       content = <<-EOT
         Shoulda::Matchers.configure do |config|
@@ -81,16 +81,13 @@ module AcceptanceTests
       end
     end
 
-    def library_config_for(library)
-      if library
-        "with.library :#{library}\n"
-      else
-        ''
-      end
+    def library_config_for(libraries)
+      libraries.map { |library| "with.library :#{library}" }.join("\n")
     end
 
-    def test_helper_file_for(test_framework, library)
-      if integrates_with_rails?(test_framework, library) || integrates_with_nunit?(test_framework)
+    def test_helper_file_for(test_framework, libraries)
+      if integrates_with_rails?(test_framework, libraries) ||
+        integrates_with_nunit?(test_framework)
         'test/test_helper.rb'
       elsif integrates_with_rspec?(test_framework)
         spec_helper_file_path
@@ -106,8 +103,8 @@ module AcceptanceTests
       test_framework == :rspec
     end
 
-    def integrates_with_rails?(test_framework, library)
-      test_framework.nil? && library == :rails
+    def integrates_with_rails?(test_framework, libraries)
+      test_framework.nil? && libraries.include?(:rails)
     end
   end
 end