diff --git a/README.md b/README.md
index 5fb6ae7..0d385ad 100644
--- a/README.md
+++ b/README.md
@@ -20,7 +20,7 @@ Based on 3 Docker images:
 7. http://localhost:8080 to see the messages show up in Kibana 3.
 8. http://localhost:5601 to use Kibana 4.
 
-This will create 4 Docker containers with Elasticsearch, Logstash, Kibana 3 and Kibana 4 running in them and connected to each other. Three ports are exposed for access:
+This will create 4 Docker containers with Elasticsearch, Logstash, Kibana 3 and Kibana 4 running in them and connected to each other. Four ports are exposed for access:
 * 5000: Logstash TCP input.
 * 9200: Elasticsearch HTTP (With Marvel plugin accessible via [http://localhost:9200/_plugin/marvel](http://localhost:9200/_plugin/marvel))
 * 8080: Kibana 3 web interface.