README.md in redis_cluster-0.2.3 vs README.md in redis_cluster-0.2.4

@@ -30,9 +30,14 @@
 rs = RedisCluster.new hosts
 rs.set "test", 1
 rs.get "test"
 ```
 
+now support keys command with scanning all nodes:
+```ruby
+rs.keys 'test*'
+```
+
 ## Benchmark test
 
 A simple benchmark at my macbook, start 4 master nodes (and 4 cold slave nodes), running with one ruby process.
 This only testing redis_cluster can work, not for redis Performance. When I fork 8 ruby process same time and run get command，redis can run 80,000 - 110,000 times per second at my macbook.