README.md in redlock-0.1.5 vs README.md in redlock-0.1.6

@@ -17,9 +17,13 @@
 >
 > There are a number of libraries and blog posts describing how to implement a DLM (Distributed Lock Manager) with Redis, but every library uses a different approach, and many use a simple approach with lower guarantees compared to what can be achieved with slightly more complex designs.
 
 This is an implementation of a proposed [distributed lock algorithm with Redis](http://redis.io/topics/distlock). It started as a fork from [antirez implementation.](https://github.com/antirez/redlock-rb)
 
+## Compatibility
+
+Redlock works with Redis versions 2.6 or later.
+
 ## Installation
 
 Add this line to your application's Gemfile:
 
 ```ruby