README.md in blind_index-0.1.0 vs README.md in blind_index-0.1.1

@@ -1,14 +1,16 @@
 # Blind Index
 
-Securely query encrypted database fields
+Securely search encrypted database fields
 
 Designed for use with [attr_encrypted](https://github.com/attr-encrypted/attr_encrypted)
 
+[![Build Status](https://travis-ci.org/ankane/blind_index.svg?branch=master)](https://travis-ci.org/ankane/blind_index)
+
 ## How It Works
 
-We use [this approach](https://www.sitepoint.com/how-to-search-on-securely-encrypted-database-fields/) described by Scott Arciszewski. To summarize, we compute a keyed hash of the sensitive data and store it in a column. To query, we apply the keyed hash function (PBKDF2-HMAC-SHA256) to the value we’re searching and then perform a database search. This results in performant queries for equality operations, while keeping the data secure from those without the key.
+This project uses [this approach](https://www.sitepoint.com/how-to-search-on-securely-encrypted-database-fields/) by Scott Arciszewski. To summarize, we compute a keyed hash of the sensitive data and store it in a column. To query, we apply the keyed hash function (PBKDF2-HMAC-SHA256) to the value we’re searching and then perform a database search. This results in performant queries for equality operations, while keeping the data secure from those without the key.
 
 ## Getting Started
 
 Add these lines to your application’s Gemfile:
 
@@ -68,11 +70,11 @@
 
 You can apply expressions to attributes before indexing and searching. This gives you the the ability to perform case-insensitive searches and more.
 
 ```ruby
 class User < ApplicationRecord
-  blind_index :email, expression: -> (v) { v.downcase } ...
+  blind_index :email, expression: ->(v) { v.downcase } ...
 end
 ```
 
 ## Multiple Indexes
 
@@ -86,11 +88,11 @@
 And update your model
 
 ```ruby
 class User < ApplicationRecord
   blind_index :email, ...
-  blind_index :email_ci, attribute: :email, expression: -> (v) { v.downcase } ...
+  blind_index :email_ci, attribute: :email, expression: ->(v) { v.downcase } ...
 end
 ```
 
 Search with:
 
@@ -107,9 +109,21 @@
   blind_index :email, iterations: 1000000, ...
 end
 ```
 
 The default is `10000`. Changing this value requires you to recompute the blind index.
+
+## Index Only
+
+If you don’t need to store the original value (for instance, when just checking duplicates), use a virtual attribute:
+
+```ruby
+class User < ApplicationRecord
+  attribute :email
+
+  blind_index :email, ...
+end
+```
 
 ## History
 
 View the [changelog](https://github.com/ankane/blind_index/blob/master/CHANGELOG.md)