README.md in fluent-plugin-keep-forward-0.1.6 vs README.md in fluent-plugin-keep-forward-0.1.7

@@ -26,9 +26,10 @@
     Furthermore, in keep_forward, you can also select "none" to disable heartbeat.
 
 - keepforward
 
     `one` for keep forwarding all data to the one node.
+    `thread` for keep forwarding to the different node in each thread.
     `tag` for keep forwarding data with the same tag to the same node.
     Default is `one`.
 
 - prefer_recover (bool)