README.md in mailkick-0.0.3 vs README.md in mailkick-0.0.4

@@ -52,11 +52,11 @@
 
 ## Sending Emails
 
 Before sending marketing emails, make sure the user has not opted out.
 
-Add the following the method to your user model.
+Add the following method to models with email addresses.
 
 ```ruby
 class User < ActiveRecord::Base
   mailkick_user
 end
@@ -66,11 +66,11 @@
 
 ```ruby
 User.opted_out
 ```
 
-And those who have not (send to these people)
+And those who have not - send to these people
 
 ```ruby
 User.not_opted_out
 ```
 
@@ -78,22 +78,10 @@
 
 ```ruby
 user.opted_out?
 ```
 
-Unsubscribe
-
-```ruby
-user.opt_out
-```
-
-Resubscribe
-
-```ruby
-user.opt_in
-```
-
 ## Bounces and Spam Reports
 
 Fetch bounces, spam reports, and unsubscribes from your email service.
 
 ```ruby
@@ -159,45 +147,28 @@
 ```
 
 Pass the `list` option to methods.
 
 ```ruby
-# scopes
 User.opted_out(list: "order_reminders")
 User.not_opted_out(list: "order_reminders")
-
-# instance methods
 user.opted_out?(list: "order_reminders")
-user.opt_out(list: "order_reminders")
-user.opt_in(list: "order_reminders")
 ```
 
-Omitting list (`nil` list) means all lists - including future lists (think “Unsubscribe All”).
-
-```ruby
-# opted out of all lists?
-user.opted_out?
-
-# opted out of the order reminder list *or* all lists?
-user.opted_out?(list: "order_reminders")
-```
-
 ### Opt-In Lists
 
 For opt-in lists, you’ll need to manage the subscribers yourself.
 
-Mailkick stores opt-outs, which you can combine with opt-ins.
+Check opt-ins against the opt-outs
 
 ```ruby
-# opt-ins minus opt-outs
 User.where(send_me_sales: true).not_opted_out(list: "sales")
 ```
 
 Check one user
 
 ```ruby
-# opted in and didn't opt out
 user.send_me_sales && !user.opted_out?(list: "sales")
 ```
 
 ## Bonus
 
@@ -210,9 +181,27 @@
 
 Change how the user is determined
 
 ```ruby
 Mailkick.user_method = proc {|email| User.where(email: email).first }
+```
+
+Use a different email field
+
+```ruby
+mailkick_user email_key: :email_address
+```
+
+Unsubscribe
+
+```ruby
+user.opt_out
+```
+
+Resubscribe
+
+```ruby
+user.opt_in
 ```
 
 ## History
 
 View the [changelog](https://github.com/ankane/mailkick/blob/master/CHANGELOG.md)