README.md in elasticsearch-extensions-0.0.17 vs README.md in elasticsearch-extensions-0.0.18

@@ -23,10 +23,10 @@
 
 ### Test::Cluster
 
 Allows to programatically start and stop an Elasticsearch cluster suitable for isolating tests.
 
-HTTP service is running on ports `9250-*` by default, and the cluster runs in-memory only.
+The HTTP service is running on ports `9250-*` by default.
 
 Start and stop the default cluster:
 
     require 'elasticsearch/extensions/test/cluster'