README.md in fluent-plugin-cloudwatch-1.2.13 vs README.md in fluent-plugin-cloudwatch-1.2.14

@@ -28,10 +28,11 @@
   dimensions_name  [dimensions_name]
   dimensions_value [dimensions value]
   period           [period] (default: 300)
   interval         [interval] (default: 300)
   delayed_start    [bool] (default: false)
+  emit_zero        [bool] (default: false)
 </source>
 ```
 
 ### GET RDS Metric
 
@@ -231,9 +232,13 @@
 flunet-plugin-cloudwatch gets metrics between now and `period` &times; 10 sec ago, and pick a latest value from that.
 
 But the latest metric is insufficient for `statistics Sum`.
 
 If `offset` is specified, fluent-plugin-cloudwatch gets metrics between `offset` sec ago and older.
+
+## config: emit_zero
+
+If `emit_zero` is true and cloudwatch datapoint is empty, fluent-plugin-cloudwatch emits 0 instead of warn log "datapoint is empty".
 
 ## Contributing
 
 1. Fork it
 2. Create your feature branch (`git checkout -b my-new-feature`)