> For the complete documentation index, see [llms.txt](https://excelhelp.windhamlabs.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://excelhelp.windhamlabs.com/getting-started/installing-excel-lab/verify-installation.md).

# Step 4: Verify Installation

Finally, verify whether you have successfully installed the add-in library. 

(1) Start Microsoft Excel

(2) Open or create a blank workbook

(3) Type `=XLABINFO()` in any cell

```excel-formula
=XLABINFO()
```

{% hint style="info" %}
Excel Lab will take a minute to initialize its computation engine.
{% endhint %}