diff --git a/src/scene.c b/src/scene.c
index 6816854..eef92c8 100644
--- a/src/scene.c
+++ b/src/scene.c
@@ -167,6 +167,8 @@ scene_trace_ray(Scene *scene, const Ray ray, const int depth)
         return out_color;
     }
 
+    // TODO: Lighting.
+
     Texture *tex = object_get_texture(intersected_obj);
     return texture_get_color(tex);
 }