diff --git a/lib/devise/active_record.rb b/lib/devise/active_record.rb
index f6bd79bc..a59431e9 100644
--- a/lib/devise/active_record.rb
+++ b/lib/devise/active_record.rb
@@ -3,7 +3,8 @@ module Devise
     # Shortcut method for including all devise modules inside your model.
     # You can give some extra options while declaring devise in your model:
     #
-    # * except: let's you add all devise modules, except the ones you setup here:
+    # * except: convenient option that allows you to add all devise modules,
+    #   removing only the modules you setup here:
     #
     #    devise :all, :except => :rememberable
     #
@@ -17,7 +18,7 @@ module Devise
     #    devise :all, :stretches => 20
     #
     # You can refer to Authenticable for more information about writing your own
-    # method to setup pepper and stretches
+    # method to setup pepper and stretches.
     #
     # Examples:
     #
diff --git a/test/models/authenticable_test.rb b/test/models/authenticable_test.rb
index fcf392fd..8e609468 100644
--- a/test/models/authenticable_test.rb
+++ b/test/models/authenticable_test.rb
@@ -3,6 +3,12 @@ require 'digest/sha1'
 
 class AuthenticableTest < ActiveSupport::TestCase
 
+  def encrypt_password(user, pepper=nil, stretches=1)
+    user.class_eval { define_method(:stretches) { stretches } } if stretches
+    user.password = '123456'
+    ::Digest::SHA1.hexdigest("--#{user.password_salt}--#{pepper}--123456--#{pepper}--")
+  end
+
   test 'should respond to password and password confirmation' do
     user = new_user
     assert user.respond_to?(:password)
@@ -78,12 +84,6 @@ class AuthenticableTest < ActiveSupport::TestCase
     assert_equal encrypt_password(user), user.encrypted_password
   end
 
-  def encrypt_password(user, pepper=nil, stretches=1)
-    user.instance_variable_set(:@stretches, stretches) if stretches
-    user.password = '123456'
-    ::Digest::SHA1.hexdigest("--#{user.password_salt}--#{pepper}--123456--#{pepper}--")
-  end
-
   test 'should fallback to devise pepper default configuring' do
     begin
       Devise.pepper = ''