README.md in fluent-plugin-bigquery-0.2.13 vs README.md in fluent-plugin-bigquery-0.2.14

@@ -231,9 +231,26 @@
 ```
 
 If attribute name is given, the time to be used for formatting is value of each row.
 The value for the time should be a UNIX time.
 
+Or, the options can use `%{time_slice}` placeholder.
+`%{time_slice}` is replaced by formatted time slice key at runtime.
+
+```apache
+<match dummy>
+  type bigquery
+  
+  ...
+  
+  project yourproject_id
+  dataset yourdataset_id
+  table   accesslog%{time_slice}
+  
+  ...
+</match>
+```
+
 ### Dynamic table creating
 
 When `auto_create_table` is set to `true`, try to create the table using BigQuery API when insertion failed with code=404 "Not Found: Table ...".
 Next retry of insertion is expected to be success.