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

# Adding Documentation

Adding documentation to your models is a great way to improve the understanding of your models and the data they produce.

There are two ways to add documentation to your models: using the tool annotations and using the [Comment](/tools/basics/comment) tool.

### Using the tool annotations

The tool annotations are helpful to add tool-specific documentation to your models. Annotations are attached to the tool itself and hence cannot be removed from the tool.

<Frame caption="Default annotations are automatically added to the tool but you can overwrite them with your own documentation.">
  <img src="https://mintcdn.com/less-51/7vxLoN8O_CeWSGG4/images/canvas/documentation/Annotations.png?fit=max&auto=format&n=7vxLoN8O_CeWSGG4&q=85&s=44677d268a8a3ac2e0a0542a229fb9e8" alt="Tool annotations" width="3628" height="2352" data-path="images/canvas/documentation/Annotations.png" />
</Frame>

You can easily change the default annotations with your own documentation. If you remove your custom annoation, it reverts to the default.

<Frame>
  <img src="https://mintcdn.com/less-51/7vxLoN8O_CeWSGG4/images/canvas/documentation/Annotations.gif?s=6a478f44caad6408cbd89beee9519e14" alt="Tool annotations" width="2000" height="1256" data-path="images/canvas/documentation/Annotations.gif" />
</Frame>

In the "options" menu in the top right corner, you can choose whether you want to show 1) all annotations, 2) none or 3) custom annotations only.

### Using the Comment tool

The [Comment](/tools/basics/comment) tool is a great way to add documentation across multiple tools. Read more Comment tool [here](/tools/utilities/comment).

<Frame>
  <img src="https://mintcdn.com/less-51/7vxLoN8O_CeWSGG4/images/canvas/documentation/Comments.png?fit=max&auto=format&n=7vxLoN8O_CeWSGG4&q=85&s=096adb4d31b377b2012b83ced1176449" alt="Comment tool" width="2194" height="1556" data-path="images/canvas/documentation/Comments.png" />
</Frame>