diff --git a/ci_scripts/packages.txt b/ci_scripts/packages.txt
index d9e81a688..751b49b59 100644
--- a/ci_scripts/packages.txt
+++ b/ci_scripts/packages.txt
@@ -114,6 +114,7 @@ python-rapidjson
 pytokens
 pyuwsgi
 PyYAML
+rtree
 ray
 rdkit
 ruamel-yaml-clib
diff --git a/docs/packages/rtree.yaml b/docs/packages/rtree.yaml
new file mode 100644
index 000000000..5587956d8
--- /dev/null
+++ b/docs/packages/rtree.yaml
@@ -0,0 +1,5 @@
+package-name: rtree
+source-code: https://github.com/Toblerity/rtree
+license: MIT
+versions:
+  - version: 1.4.1