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

# Project Custom Instructions

Users can customize project instructions from the project settings dialog, as explained in [Adding custom instructions](/en/user-manual/adding-custom-instructions).

These instructions are applied at the project level and influence how Zylon responds in chats.

### Configuration

Use the following key to control the maximum instructions length:

```yaml theme={null}
features:
  maxInstructionsLength: 4000
```

### Configuration details

| Key                     | Default | Values           | Description                                                               |
| ----------------------- | ------- | ---------------- | ------------------------------------------------------------------------- |
| `maxInstructionsLength` | `4000`  | Positive integer | Maximum instructions length accepted by both the Workspace UI and the API |