1 files changed, 1 insertions, 0 deletions
diff --git a/dat.h b/dat.h
index 26755c5..9a27f17 100644
--- a/dat.h
+++ b/dat.h
@@ -141,6 +141,7 @@ struct Universe
 	double t, timeacc;
 
 	void (*step)(Universe*, double);
+	void (*collide)(Universe*);
 	void (*reset)(Universe*);
 };