README.md in second_level_cache-2.0.0.rc1 vs README.md in second_level_cache-2.0.0

@@ -15,13 +15,19 @@
 ## Install
 
 In your gem file:
 
 ```ruby
-gem "second_level_cache", "~> 2.0.0"
+gem "second_level_cache", "~> 2.0.0.rc1"
 ```
 
+For ActiveRecord 3:
+
+```ruby
+gem "second_level_cache", "~> 1.6"
+```
+
 ## Usage
 
 For example, cache User objects:
 
 ```ruby
@@ -32,12 +38,10 @@
 
 Then it will fetch cached object in this situations:
 
 ```ruby
 User.find(1)
-User.where(:status => 1).find_by_id(1)
-user.articles.find_by_id(1)
 user.articles.find(1)
 User.where(:status => 1).find(1)
 article.user
 ```
 
@@ -127,9 +131,17 @@
 user = User.fetch_by_uniq_key("hooopo", :nick_name)
 
 # this also fetch from cache
 user = User.fetch_by_uniq_key!("hooopo", :nick_name) # this will raise `ActiveRecord::RecordNotFound` Exception when nick name not exists.
 ```
+
+* You can use Rails's [Eager Loading](http://guides.rubyonrails.org/active_record_querying.html#eager-loading-associations) feature as normal. Even better, second_level_cache will transform the `IN` query into a Rails.cache.multi_read operation. For example:
+
+```ruby
+Answer.includes(:question).limit(10).order("id DESC").each{|answer| answer.question.title}
+Answer Load (0.2ms)  SELECT `answers`.* FROM `answers` ORDER BY id DESC LIMIT 10 # Only one SQL query and one Rails.cache.read_multi fetching operation.
+```
+[Details for read_multi feature](http://hooopo.writings.io/articles/a9cae5e0).
 
 ## Contributors
 
 * [chloerei](https://github.com/chloerei)
 * [reyesyang](https://github.com/reyesyang)