---
title: Update the AI Security for Apps custom topics of a zone.
---
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[API Reference](https://developers.cloudflare.com/api)
[AI Security](https://developers.cloudflare.com/api/resources/ai_security)
[Custom Topics](https://developers.cloudflare.com/api/resources/ai_security/subresources/custom_topics)
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# Update the AI Security for Apps custom topics of a zone.
PUT/zones/{zone\_id}/ai-security/custom-topics
Update the custom topic list of the zone, overwriting it entirely with the topics in the request, so include every topic you want to keep. Changes can take up to a minute to propagate.
Each entry has a `label`, used to reference the topic in rule expressions and analytics, and a `topic` description, which the classifier scores prompts against while AI Security for Apps is enabled. The following rules apply:
- A zone can hold at most 20 topics.
- `label` must be 2–20 characters, using only lowercase letters (a–z), digits (0–9), and hyphens.
- `topic` must be 2–50 printable ASCII characters.
- Labels must be unique within the zone, and so must topic descriptions.
##### Security
API Token
The preferred authorization scheme for interacting with the Cloudflare API. Create a token.
**Example:**Authorization: Bearer Sn3lZJTBX6kkg7OdcBUAxOO963GEIyGQqnFTOFYY
API Email + API Key
The previous authorization scheme for interacting with the Cloudflare API, used in conjunction with a Global API key.
**Example:**X-Auth-Email: user@example.com
The previous authorization scheme for interacting with the Cloudflare API. When possible, use API tokens instead of Global API keys.
**Example:**X-Auth-Key: 144c9defac04969c7bfad8efaa8ea194
##### P ath ParametersExpand Collapse
zone\_id: string
Defines the zone.
maxLength32
[Link to this property](<#(resource)%20ai_security.custom_topics%20%3E%20(method)%20update%20%3E%20(params)%20default%20%3E%20(param)%20zone_id%20%3E%20(schema)>)
##### Body ParametersJSONExpand Collapse
topics: optional array of object {label, topic }
Custom topic categories for AI Security for Apps content detection.
label: string
Unique label identifier. Must contain only lowercase letters (a–z), digits (0–9), and hyphens.
maxLength20
minLength2
Link to this property
topic: string
Description of the topic category. Must contain only printable ASCII characters.
maxLength50
minLength2
Link to this property
[Link to this property](<#(resource)%20ai_security.custom_topics%20%3E%20(method)%20update%20%3E%20(params)%200%20%3E%20(param)%20topics%20%3E%20(schema)>)
##### ReturnsExpand Collapse
errors: array of ResponseInfo { code, message, documentation\_url, source }
code: number
minimum1000
Link to this property
message: string
Link to this property
documentation\_url: optional string
Link to this property
source: optional object {pointer }
pointer: optional string
Link to this property
Link to this property
[Link to this property](<#(resource)%20ai_security.custom_topics%20%3E%20(method)%20update%20%3E%20(network%20schema)%20%3E%20(property)%20errors>)
messages: array of ResponseInfo { code, message, documentation\_url, source }
code: number
minimum1000
Link to this property
message: string
Link to this property
documentation\_url: optional string
Link to this property
source: optional object {pointer }
pointer: optional string
Link to this property
Link to this property
[Link to this property](<#(resource)%20ai_security.custom_topics%20%3E%20(method)%20update%20%3E%20(network%20schema)%20%3E%20(property)%20messages>)
result: object {topics }
topics: optional array of object {label, topic }
Custom topic categories for AI Security for Apps content detection.
label: string
Unique label identifier. Must contain only lowercase letters (a–z), digits (0–9), and hyphens.
maxLength20
minLength2
Link to this property
topic: string
Description of the topic category. Must contain only printable ASCII characters.
maxLength50
minLength2
Link to this property
Link to this property
[Link to this property](<#(resource)%20ai_security.custom_topics%20%3E%20(method)%20update%20%3E%20(network%20schema)%20%3E%20(property)%20result>)
success: true
Defines whether the API call was successful.
[Link to this property](<#(resource)%20ai_security.custom_topics%20%3E%20(method)%20update%20%3E%20(network%20schema)%20%3E%20(property)%20success>)
### Update the AI Security for Apps custom topics of a zone.
HTTP
HTTPTypeScriptPythonGoTerraform
```
curl https://api.cloudflare.com/client/v4/zones/$ZONE_ID/ai-security/custom-topics \
-X PUT \
-H 'Content-Type: application/json' \
-H "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \
-d '{}'
```
200 example
```
{
"errors": [
{
"code": 1000,
"message": "message",
"documentation_url": "documentation_url",
"source": {
"pointer": "pointer"
}
}
],
"messages": [
{
"code": 1000,
"message": "message",
"documentation_url": "documentation_url",
"source": {
"pointer": "pointer"
}
}
],
"result": {
"topics": [
{
"label": "credit-cards",
"topic": "credit card numbers"
}
]
},
"success": true
}
```
##### Returns Examples
200 example
```
{
"errors": [
{
"code": 1000,
"message": "message",
"documentation_url": "documentation_url",
"source": {
"pointer": "pointer"
}
}
],
"messages": [
{
"code": 1000,
"message": "message",
"documentation_url": "documentation_url",
"source": {
"pointer": "pointer"
}
}
],
"result": {
"topics": [
{
"label": "credit-cards",
"topic": "credit card numbers"
}
]
},
"success": true
}
```