diff --git a/README.md b/README.md
index c29e933..b9b2663 100644
--- a/README.md
+++ b/README.md
@@ -781,6 +781,7 @@ Long list of geospatial analysis tools. Geospatial analysis, or just spatial ana
 * [GeoTrellis](https://github.com/locationtech/geotrellis) - GeoTrellis is a Scala library and framework that uses Spark to work with raster data.
 * [mapnik2geotools](https://github.com/dwins/mapnik2geotools) - Using the Scala XML API to translate from Mapnik XML to GeoTools' SLD dialect.
 * [osm4scala](https://simplexspatial.github.io/osm4scala/) - High perfromance Scala library and Spark Polyglot (Scala, Python, SQL, etc.) connector for OpenStreetMap Pbf files.
+* [RTree2D](https://github.com/plokhotnyuk/rtree2d) - RTree2D is a 2D immutable R-tree with STR (Sort-Tile-Recursive) packing for ultra-fast nearest and intersection queries.
 
 ## Groovy