README.md in second_level_cache-2.0.0 vs README.md in second_level_cache-2.1.0.rc1

@@ -77,11 +77,11 @@
 ```ruby
 # this query will NOT be cached
 User.select("id, name").find(1)
 ```
 
-Notice:
+## Notice
 
 * SecondLevelCache cache by model name and id, so only find_one query will work.
 * Only equal conditions query WILL get cache; and SQL string query like `User.where("name = 'Hooopo'").find(1)` WILL NOT work.
 * SecondLevelCache sync cache after transaction commit:
 
@@ -97,9 +97,15 @@
 ActiveRecord::Base.transaction do
    user.save
    account.save
 end # <- Cache write 
 Rails.logger.info "info"
+```
+
+* If you are using SecondLevelCache with database_cleaner, you should set cleaning strategy to `:truncation`:
+
+```ruby
+DatabaseCleaner.strategy = :truncation
 ```
 
 ## Configure
 
 In production env, we recommend to use [Dalli](https://github.com/mperham/dalli) as Rails cache store.