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4 changes: 4 additions & 0 deletions src/engage/faqs.md
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Expand Up @@ -33,6 +33,10 @@ The following response indicates that Bob is a high-value user:

For more information on profile queries, visit the [Profile API documentation](/docs/unify/profile-api).

## Can I remove a trait from a User profile?

To remove a trait from a user profile, you can send in a key-value pair in the properties object with null in an event from one of the connected sources, e.g. `"properties": {"trait1": null, ...}, ....`. Sending in an empty string i.e. `,"trait2": "",` will also have the same effect.

## Can I modify audience keys?

You can't change the audience key after it's created. To change the key, you need to re-create the audience.
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