# Annotate Segmentation Masks with a Brush

<figure><img src="/files/OR9163p4pRfISFNJ5g2E" alt=""><figcaption></figcaption></figure>

You can now annotate images in an Instance Segmentation project using the Brush Tool. This tool allows you to paint annotations with an adjustable brush.

To use the brush tool, press "U" on your keyboard in the Roboflow Annotate interface, or select the paint brush icon from the right side panel. You can then click and hold your cursor down to paint a region in an image.


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.roboflow.com/changelog/explore-by-month/november-2025/annotate-segmentation-masks-with-a-brush.md?ask=<question>
```

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Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.