README.md in nogara-redis_failover-0.8.9 vs README.md in nogara-redis_failover-0.8.10

@@ -127,9 +127,19 @@
      :db            - db to use for redis nodes (optional)
      :namespace     - namespace for redis nodes (optional)
      :logger        - logger override (optional)
      :retry_failure - indicate if failures should be retried (default true)
      :max_retries   - max retries for a failure (default 3)
+     :safe_mode     - indicates if safe mode is used or not (default true)
+     :master_only   - indicates if only redis master is used (default false)
+
+The RedisFailover::Client also supports a custom callback that will be invoked whenever the list of redis clients changes. Example usage:
+
+    RedisFailover::Client.new(:zkservers => 'localhost:2181,localhost:2182,localhost:2183') do |client|
+      client.on_node_change do |master, slaves|
+        logger.info("Nodes changed! master: #{master}, slaves: #{slaves}")
+      end
+    end
 
 ## Manual Failover
 
 Manual failover can be initiated via RedisFailover::Client#manual_failover. This schedules a manual failover with the
 currently active Node Manager. Once the Node Manager receives the request, it will either failover to the specific