diff --git a/src/libsm64.c b/src/libsm64.c
index 68400af..cc16daa 100644
--- a/src/libsm64.c
+++ b/src/libsm64.c
@@ -78,6 +78,7 @@ static void free_area( struct Area *area )
 
 static void update_terrain_objects( void )
 {
+    // TODO, this is way more expensive than it needs to be.
     update_dynamic_surface_list(); 
 }