diff --git a/src/collider/Makefile.am b/src/collider/Makefile.am
index 6946719..9475b79 100644
--- a/src/collider/Makefile.am
+++ b/src/collider/Makefile.am
@@ -1,5 +1,5 @@
 noinst_LIBRARIES = libcollider.a
 libcollider_a_SOURCES = geom_tree.cpp geom.cpp collision_space.cpp
 
-include_HEADERS = geom_tree.h geom.h collision_space.h
+include_HEADERS = geom_tree.h geom.h collision_space.h collider.h
 
diff --git a/src/collider/collider.h b/src/collider/collider.h
new file mode 100644
index 0000000..f9c292e
--- /dev/null
+++ b/src/collider/collider.h
@@ -0,0 +1,16 @@
+#pragma once
+#include "../vector.h"
+#include "geom_tree.h"
+#include "collision_space.h"
+#include "geom.h"
+
+class Geom;
+
+struct CollisionContact {
+  vector3d pos;
+  vector3d normal;
+  double depth;
+  int triIdx;
+  Geom* g1, *g2;
+};
+