Updated readme

Author: pkittenis

README.md

@@ -4,10 +4,12 @@ parallel-ssh
 Small wrapper library over paramiko that allows for parallel execution of SSH commands on remote hosts and executing simple single host commands over SSH
 
 .. image:: https://api.travis-ci.org/pkittenis/parallel-ssh.png?branch=master
-        :target: https://travis-ci.org/pkittenis/parallel-ssh
+	:target: https://travis-ci.org/pkittenis/parallel-ssh
 
 Installation
 ============
+To install gevent you need the libevent-dev package installed. Instructions below are for apt-get systems, substitute with your own package manager if necessary.
+
 	sudo apt-get install libevent-dev
 	pip install parallel-ssh