README.md in blingfire-0.1.6 vs README.md in blingfire-0.1.7

@@ -80,9 +80,23 @@
 
 ```ruby
 model = BlingFire.load_model("roberta.bin", prefix: false)
 ```
 
+## Ids to Text [experimental]
+
+Load a model
+
+```ruby
+model = BlingFire.load_model("bert_base_tok.i2w")
+```
+
+Convert ids to text
+
+```ruby
+model.ids_to_text(ids)
+```
+
 ## History
 
 View the [changelog](https://github.com/ankane/blingfire/blob/master/CHANGELOG.md)
 
 ## Contributing