README.md in vagrant-vultr-0.1.2 vs README.md in vagrant-vultr-0.1.3

@@ -29,10 +29,15 @@
     vultr.plan = '768 MB RAM,15 GB SSD,1.00 TB BW'
 
     # Use either OS name or Snapshot identifier
     vultr.os = 'Ubuntu 14.04 x64'
     vultr.snapshot = '524557af2439b'
+
+    # Optional parameters
+    vultr.label    = 'My Label'
+    vultr.tag      = 'My Tag'
+    vultr.hostname = 'myhostname'
   end
 end
 ```
 
 Now start vagrant box:
@@ -44,9 +49,10 @@
 Notes
 -----
 
 1. You have to specify `override.ssh.private_key_path`. Public key will be uploaded to Vultr as "vagrant" SSH key and will be used when servers are created.
 2. Currently, servers are created with "root" user.
+3. If you hit API rate limit, you can set `VULTR_RATE_LIMIT_INTERVAL_MS` environment variable to introduce delay between API requests.
 
 Testing
 -------
 
 First of all, add the box that is used for testing: