README.md in valid_email2-2.2.1 vs README.md in valid_email2-2.2.2

@@ -3,12 +3,12 @@
 [![Gem Version](https://badge.fury.io/rb/valid_email2.png)](http://badge.fury.io/rb/valid_email2)
 
 Validate emails with the help of the `mail` gem instead of some clunky regexp.
 Aditionally validate that the domain has a MX record.
 Optionally validate against a static [list of disposable email services](vendor/disposable_emails.yml).
+Optionally validate that the email is not subaddressed ([RFC5233](https://tools.ietf.org/html/rfc5233)).
 
-
 ### Why?
 
 There are lots of other gems and libraries that validates email addresses but most of them use some clunky regexp.
 I also saw a need to be able to validate that the email address is not coming from a "disposable email" provider.
 
@@ -56,13 +56,18 @@
 To validate that the domain is not blacklisted (under vendor/blacklist.yml):
 ```ruby
 validates :email, 'valid_email_2/email': { blacklist: true }
 ```
 
+To validate that email is not subaddressed:
+```ruby
+validates :email, 'valid_email_2/email': { disallow_subaddressing: true }
+```
+
 All together:
 ```ruby
-validates :email, 'valid_email_2/email': { mx: true, disposable: true }
+validates :email, 'valid_email_2/email': { mx: true, disposable: true, disallow_subaddressing: true}
 ```
 
 > Note that this gem will let an empty email pass through so you will need to
 > add `presence: true` if you require an email
 
@@ -71,9 +76,10 @@
 ```ruby
 address = ValidEmail2::Address.new("[e-mail]")
 address.valid? => true
 address.disposable? => false
 address.valid_mx? => true
+address.subaddressed? => false
 ```
 
 ### Test environment
 
 If you are validating `mx` then your specs will fail without an internet connection.