---
title: "Add document types - Amplia Reg"
description: "How to add custom holder file types to Amplia Reg with the HolderFileTypes configuration section, and how to reference them in the API."
canonical: "https://docs.lacunasoftware.com/en-us/articles/amplia-reg/on-premises/add-doc-types"
locale: "en"
product: "Amplia Reg"
last_updated: "2026-07-14"
---

# Add document types - Amplia Reg

To add custom holder file types, add a section to your configuration file named **HolderFileTypes** with entries following the syntax `Type=Name`, for instance:

Example (.ini/.conf file):

```ini
[HolderFileTypes]
CustomDoc1=My first custom document name
CustomDoc2=My second custom document name
```

Example (environment variables):

```sh
HolderFileTypes__CustomDoc1=My first custom document name
HolderFileTypes__CustomDoc2=My second custom document name
```

Types are case-sensitive and must have **at most 15 characters**. `PascalCase` is recommended.

> **Note**
>
> When referencing custom types on the API, the type must be prefixed with `@`. For instance, to reference the custom type `CustomDoc1` on an
> API request you must send `@CustomDoc1`.