Update README.md

README.md

@@ -14,10 +14,10 @@ Currently this tool checks the following:
 | Validation  | Description |
 | ------------- | ------------- |
 | MX records  | Checks if the email's domain has valid MX records  |
-| Valid format  | Validates e-mail addresses against the syntax in RFC 822, with the exceptions that comments and whitespace folding and dotless domain names are not supported (as it uses PHP's filter_var().  |
+| Valid format  | Validates e-mail addresses against the syntax in RFC 822, with the exceptions that comments and whitespace folding and dotless domain names are not supported (as it uses PHP's [filter_var()](http://php.net/manual/en/function.filter-var.php)).  |
 | Email Host  | Checks if the email's host (e.g gmail.com) is reachable  |
 | Role/Business Email^  | Checks if the email is a role/business based email (e.g info@reddit.com).  |
-| Disposable email provider^  | Checks if the email is a disposable email (e.g person@10minutemail.com).  |
+| Disposable email provider^  | Checks if the email is a [disposable email](https://en.wikipedia.org/wiki/Disposable_email_address) (e.g person@10minutemail.com).  |
 | Free email provider^  | Checks if the email is a free email (e.g person@yahoo.com).  |
 | Misspelled Email ^ | Checks the email for possible typos and returns a suggested correction (e.g hi@gmaol.con -> hi@gmail.com).  |