> ## Documentation Index
> Fetch the complete documentation index at: https://docs.getdecisional.ai/llms.txt
> Use this file to discover all available pages before exploring further.
# Supported Sources
> Covers the list of sources that are supported on Decisional.
# Sources
In order to use a Decisional Knowledge engine you need to provide it sources on which it can be grounded on. This process of `grounding` ensures that you do not get any hallucinations when we generate an AI workup. To learn more about creating a knowledge engine, visit the section [Setup your first knowledge engine](https://docs.getdecisional.ai/welcome/first-knowledge-engine). The following table outlines various information source types and indicates whether decisional knowledge engines can effectively support them:
### Supported Source Table
| Source | Extension | Status | Info |
| ------- | --------- | ---------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| File | PDF | Supported | |
| File | docx | Supported | `docx` will be automatically converted to PDF formats in order to support vision analysis. |
| File | doc | Supported | `doc` will be automatically converted to PDF formats in order to support vision analysis. |
| File | xls | Partially Supported | Single worksheet files supported where the the header rows and header columns are in the first row and first column of the spreadsheet respectively |
| File | xlsx | Partially Supported | Single worksheet files supported where the the header rows and header columns are in the first row and first column of the spreadsheet respectively |
| File | csv | Partially Supported | Single worksheet files supported where the the header rows and header columns are in the first row and first column of the spreadsheet respectively |
| File | text | Supported | `txt` will be automatically converted to PDF formats in order to support vision analysis. |
| File | ppt | Supported | `ppt` will be automatically converted to PDF formats in order to support vision analysis. |
| File | pptx | Supported | `pptx` will be automatically converted to PDF formats in order to support vision analysis. |
| Email | | Supported | Emails forwarded to the knowledge engine are uploaded with the body of the email along with attachments as a PDF to support vision analysis. To learn how to upload - click on upload sources and choose the "Upload through emails" option |
| Website | | Coming Soon | |
### Sample Spreadsheet supported
File formats like `xls` , `xlsx`, `csv` can be supported in when the spreadsheet has a certain structure, i.e header rows and header columns are the same as the first row & column. Sample spreadsheet that is supported on Decisional can be seen [here](https://docs.google.com/spreadsheets/d/1NGnEhR37FP70fCySkgHzmiha1pTzCH1gfvfieDp91b4/edit?gid=0#gid=0).
