diff --git a/src/geom/geom.rs b/src/geom/geom.rs
index deae997..f9874ff 100644
--- a/src/geom/geom.rs
+++ b/src/geom/geom.rs
@@ -20,3 +20,6 @@ pub use self::ray::Ray3;
 pub mod plane;
 pub mod point;
 pub mod ray;
+
+pub mod octree;
+pub mod quadtree;
diff --git a/src/geom/octree.rs b/src/geom/octree.rs
new file mode 100644
index 0000000..31a0028
--- /dev/null
+++ b/src/geom/octree.rs
@@ -0,0 +1,18 @@
+// Copyright 2013 The Lmath Developers. For a full listing of the authors,
+// refer to the AUTHORS file at the top-level directory of this distribution.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// TODO
+
+// http://gameprogrammingpatterns.com/spatial-partition.html
diff --git a/src/geom/quadtree.rs b/src/geom/quadtree.rs
new file mode 100644
index 0000000..31a0028
--- /dev/null
+++ b/src/geom/quadtree.rs
@@ -0,0 +1,18 @@
+// Copyright 2013 The Lmath Developers. For a full listing of the authors,
+// refer to the AUTHORS file at the top-level directory of this distribution.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// TODO
+
+// http://gameprogrammingpatterns.com/spatial-partition.html