# Is Domain file needed for NLU?

**URL:** https://forum.rasa.com/t/is-domain-file-needed-for-nlu/35035
**Category:** Getting Started with Rasa
**Created:** [September 28, 2020, 2:25pm UTC](https://forum.rasa.com/t/is-domain-file-needed-for-nlu/35035 "2020-09-28T14:25:56Z")
**Posts on this page:** 1
**Showing post:** 1

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### Author: ![lostinlogic](https://dub1.discourse-cdn.com/flex013/user_avatar/forum.rasa.com/lostinlogic/32/11133_2.png) [@lostinlogic](https://forum.rasa.com/u/lostinlogic)
#### Post date: [September 28, 2020, 2:25pm UTC](https://forum.rasa.com/t/is-domain-file-needed-for-nlu/35035/1 "2020-09-28T14:25:56Z")

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Hi, sorry if this is an obvious question.

Is the domain file used at all for Rasa NLU? I.e. If I just want to get intent classifications, and extract entities and use the `rasa train nlu` command, the do I need to create and maintain the domain.yml file?

My understanding is the domain file is only required to be updated if I am using Rasa also for the dialogue/slot filling capabilities (I’m not as I’m moving from LUIS and so that’s being done further up the stack).

I just want to make sure I won’t be impacting the intent predictions, or ability to extract entities if I don’t list them both in the domain file.

Thanks,

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