> ## Documentation Index
> Fetch the complete documentation index at: https://docs.permutive.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Editing a Seed Segment

> Learn how to update the underlying seed for your lookalike model.

If you need to change the definition of the publisher users your model is learning from, you can edit the properties of the seed segment.

## How to Edit

<Steps>
  ### Locate the Publisher Seed Segment

  Find the original custom or matched cohort you used as the seed for your model.

  ### Update Cohort Rules

  Edit the publisher cohort's rules or filters to reflect your new requirements.

  ### Automatic Retraining

  Once the seed segment is updated, Permutive will automatically detect the change. The associated lookalike model will be scheduled for retraining during the next daily cycle.
</Steps>

<Note>
  Retraining takes up to **24 hours**. During this time, your existing lookalike cohorts will continue to function based on the previous version of the model.
</Note>

## Impact on Existing Cohorts

When the model finishes retraining with the new seed data:

* All lookalike cohorts created from that model will automatically update to reflect the new behavioral patterns.
* You do **not** need to recreate the lookalike cohorts manually.
* The **Precision vs. Reach** curve may shift based on the new data.

<Warning>
  If you delete the seed segment entirely, the model will stop receiving new data and will eventually become less accurate, though existing lookalike cohorts will continue to work for a period of time.
</Warning>