README.md in kakine-0.6.4 vs README.md in kakine-0.6.5

@@ -89,9 +89,17 @@
 auth_url: "http://your-openstack-endpoint/v2.0"
 username: "admin"
 password: "admin"
 ```
 
+also, you can set some options.
+
+```
+client_cert: "/path/to/cert.pem"
+client_key: "/path/to/key.pem"
+region_name: "YourRegion"
+```
+
 ### Commands
 
 run following command.
 
 ```sh