> For the complete documentation index, see [llms.txt](https://typless.gitbook.io/typlessapi/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://typless.gitbook.io/typlessapi/typless/document-type/extending-and-editing.md).

# Extending and Editing

**Document type** is your configuration for data extraction of a single type of document, some of which can be changed later on.\
You can edit document types on the [Dashboard page](https://app.typless.com).\
Look for your document type in the list, and click on the ![pen icon](https://typless-public.s3-eu-west-1.amazonaws.com/pen.png).

**You can always:**

✅ Add new metadata fields

✅ Add new line item fields

**After creation, you cannot:**

❌ Change OCR engine

❌ Change field names

❌ Change document type name

❌ Delete metadata fields

❌ Delete line item fields