--- a/include/octree.h	Wed Mar 19 17:18:59 2008 +0100
+++ b/include/octree.h	Wed Mar 26 00:52:27 2008 +0100
@@ -35,6 +35,9 @@
 
 using namespace std;
 
+/**
+ * a node of octree
+ */
 class OctreeNode
 {
     union {
@@ -64,6 +67,9 @@
 	void subdivide(BBox bbox, int maxdepth);
 };
 
+/**
+ * optimized octree
+ */
 class Octree: public Container
 {
 	OctreeNode *root;