README.md in fluent-plugin-elapsed-time-0.0.3 vs README.md in fluent-plugin-elapsed-time-0.0.4

@@ -91,9 +91,17 @@
     Measure and emit outputs for each `tag` or `all`. Default is `all`.
 
     `all` measures `max` and `avg` for all input messages.
     `tag` measures `max` and `avg` for each tag *modified* by `add_tag_prefix`, `remove_tag_prefix`, or `remove_tag_slice`. 
 
+* zero_emit *bool*
+
+    Emit 0 on the next interval. This is useful for some software which requires resetting data such as [GrowthForecast](http://kazeburo.github.io/GrowthForecast).
+
+        elapsed: {"max":1.013,"avg":0.123,"num"=>0}
+        # after @interval later
+        elapsed: {"max":0,"avg":0,"num"=>0}
+
 ## ChangeLog
 
 See [CHANGELOG.md](CHANGELOG.md) for details.
 
 ## Contributing