~ minor important changes to README file.

README

@@ -32,6 +32,7 @@ A new static base firewall setup can be created by simply calling make in
 the source folder but be aware that once ipturntables.sh is started it
 utilizes iptables immediately, meaning it changes the firewall rules of
 the host it has been run on. (YOU HAVE BEEN WARNED!)
-If you don't intend to use it but wanna see what it does an appropriate
+Therefore Makefile.example needs to be renamed to Makefile before make can
+be used. If you don't intend to use it but wanna see what it does an appropriate
 environment is recommended eg. a VM to avoid interference with your running
 setup. For a detailed manual page see the ipturntables.8 file.