# Use of Out of Vocabulary - OOV

**URL:** <https://forum.rasa.com/t/use-of-out-of-vocabulary-oov/24896>\
**Category:** Rasa Open Source\
**Created:** [February 17, 2020, 11:16am UTC](https://forum.rasa.com/t/use-of-out-of-vocabulary-oov/24896 "2020-02-17T11:16:48Z")\
**Posts on this page:** 1\
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**Author:** ![varunsapre10](https://dub1.discourse-cdn.com/flex013/user_avatar/forum.rasa.com/varunsapre10/32/6520_2.png) [@varunsapre10](https://forum.rasa.com/u/varunsapre10)\
**Post date:** [February 17, 2020, 11:16am UTC](https://forum.rasa.com/t/use-of-out-of-vocabulary-oov/24896/1 "2020-02-17T11:16:48Z")

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How do I use the OOV token in my rasa bot? I read about it in the documentation but did not get a clear idea about how to use it. Where in my file(action,domain,nlu) do I insert the oov\_word or oov\_token?? I need a stepwise solution to this to not make it more tiresome that it already is 😄…

Example : I have to get any reason for an employee leave application. Kindly guide me.

Also, since I have used supervised\_embeddings as the pipeline, do I change the pipeline or do I need to add “CountVectorsFeaturizer” to the existing pipeline?

Thanks in Advance!!

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