more README updates

ryanlecompte · Apr 15, 2012 · 9f1dbd3 · 9f1dbd3
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@@ -36,6 +36,8 @@ optionally retry the operation.
 
 ## Installation
 
+redis_failover has an external dependency on ZooKeeper. You must have a running ZooKeeper cluster already available in order to use redis_failover. ZooKeeper provides redis_failover with its high availability and data consistency between Redis::Failover clients and the Node Manager daemon.Please see the requirements section below for more information on installing and setting up ZooKeeper if you don't have it running already.
+
 Add this line to your application's Gemfile:
 
     gem 'redis_failover'