--- a/include/kdtree.h	Wed Mar 19 17:18:59 2008 +0100
+++ b/include/kdtree.h	Wed Mar 26 00:52:27 2008 +0100
@@ -36,6 +36,9 @@
 
 using namespace std;
 
+/**
+ * a node of kd-tree
+ */
 class KdNode
 {
 	Float split;
@@ -66,6 +69,9 @@
 	void subdivide(BBox bbox, int maxdepth);
 };
 
+/**
+ * kd-tree
+ */
 class KdTree: public Container
 {
 	KdNode *root;