> For the complete documentation index, see [llms.txt](https://docs.sentiance.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.sentiance.com/important-topics/sdk/appendix/custom-user-metadata.md).

# Custom User Metadata

Custom metadata allows you to store text-based key-value user properties into the Sentiance Platform. These keys and values are treated as opaque strings and are meant for retrieval only. There is a limit of 50 properties per user and a limit of 500 characters for keys and values.

Typical examples include custom user and application-related properties you need after the processing.

## Example

Here we will add a single field "correlation\_id" to the metadata, with a value of '3a5276ec-b2b2-4636-b893-eb9a9f014938'.

{% tabs %}
{% tab title="iOS" %}

```swift
Sentiance.shared.addUserMetadataFields(["correlation_id": "3a5276ec-b2b2-4636-b893-eb9a9f014938"])
```

{% endtab %}

{% tab title="Android" %}

```kotlin
sentiance.addUserMetadataField("correlation_id", "3a5276ec-b2b2-4636-b893-eb9a9f014938")
```

{% endtab %}
{% endtabs %}


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