Update README.md

README.md

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 **DALES 2** is a renovated large-scale **aerial LiDAR** benchmark for **3D scene understanding**, built on the geographic coverage of the original [DALES](https://udayton.edu/blogs/artssciences/2020-stories/dales-large-scale-aerial-lidar.php) release with **re-annotated** semantic and **instance** labels, refined taxonomy, and companion **scene-graph** structure (objects and relations) described in the USM3D workshop paper at CVPR 2026.
 
-This Hub repository distributes the **annotated point clouds** (typically LAZ/LAS per tile). **Graph JSON** and the interactive **graph editing tool** live in the companion code repository (see [Scene graph tool](#scene-graph-tool)).
+This Hub repository distributes the **annotated point clouds** (typically LAZ/LAS per tile). **Graph JSON** and the interactive **[graph editing tool](https://github.com/mbendjilali/dales-2)** live in the companion code repository (see [Scene graph tool](#scene-graph-tool)).
 
 ### What is new vs. DALES Objects