---
title: "PATCH /largefacelists/{largeFaceListId}/persistedfaces/{persistedFaceId}"
method: PATCH
path: "/largefacelists/{largeFaceListId}/persistedfaces/{persistedFaceId}"
---

# PATCH /largefacelists/{largeFaceListId}/persistedfaces/{persistedFaceId}

`PATCH /largefacelists/{largeFaceListId}/persistedfaces/{persistedFaceId}`

Update a specified face's userData field in a Large Face List by its persistedFaceId.

## Path parameters

- `largeFaceListId` string, required
- `persistedFaceId` string, uuid, required

## Request body

- FaceUserData — User defined data for persisted face.
  - `userData` string — User-provided data attached to the face. The length limit is 1K.

## Response `200`

The request has succeeded.

## Other responses

- `default` — An unexpected error response.

## Changes

- **2026-07-13** `e1f63ec9983b` — 1 info
  - api operation id `LargeFaceList_UpdateFace` removed and replaced with `FaceListOperations_UpdateLargeFaceListFace`

[Change history](https://skmtc.dev/azure/apis/ai-face/changes/largefacelists/:largeFaceListId/persistedfaces/:persistedFaceId/patch.md)

---

[API](https://skmtc.dev/azure/apis/ai-face.md) · [All operations](https://skmtc.dev/azure/apis/ai-face/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/azure/ai-face/revisions/e9a68c525be6/schema)