# Searching faces in a collection

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This page was generated from content adapted from the [AWS Developer Guide](https://github.com/awsdocs/amazon-rekognition-developer-guide.git)
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## Tagging collections

* **Note**\
  If you do not know the collection's Amazon Resource Name, you can use the `DescribeCollection` operation.

## Adding faces to a collection

* **Note**\
  `DetectFaces` returns the same information, so you don't need to call both `DetectFaces` and `IndexFaces` for the same image.
* **Note**\
  To use quality filtering, you need a collection that's associated with version 3, or higher, of the face model. To get the version of the face model associated with a collection, call [DescribeCollection](https://docs.aws.amazon.com/rekognition/latest/APIReference/API_DescribeCollection.html).

## Searching for a face (image)

* **Note**\
  If the service detects multiple faces in the input image, it uses the largest face that's detected for searching the face collection.


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# Agent Instructions: Querying This Documentation

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Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
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```

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The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.