README.md in fluent-plugin-yohoushi-0.0.1 vs README.md in fluent-plugin-yohoushi-0.0.2

@@ -62,10 +62,10 @@
 
     Set to `true` if you are enabling `--enable_float_number` option of GrowthForecast. Default is `false`
 
 - mode
 
-    The graph mode (either of gauge, count, or modified). Just same as mode of GrowthForecast POST parameter. Default is gauge.
+    The graph mode (either of gauge, count, modified, or derive). Just same as mode of GrowthForecast POST parameter. Default is gauge.
 
 ### Placeholders
 
 The keys of input json are available as placeholders. In the above example,