diff --git a/sim_scenes/solar_system/speed_of_light.py b/sim_scenes/solar_system/speed_of_light.py
index cee47b6bd0129214f12193a647fb5a643ca919de..f10a08767348b3ed8669e8439914c9464838cae5 100644
--- a/sim_scenes/solar_system/speed_of_light.py
+++ b/sim_scenes/solar_system/speed_of_light.py
@@ -27,6 +27,7 @@ light_body = create_light_body(init.light_size_scale, init.light_init_position,
 # 增加光速天体到天体集合
 bodies.append(light_body)
 
+# 运行前指定bodies、light_body并订阅事件
 init.bodies = bodies
 init.light_body = light_body
 init.event_subscription()