diff --git a/03-UnrealEngine/Rendering/RenderingPipeline/Lighting/Lighting.md b/03-UnrealEngine/Rendering/RenderingPipeline/Lighting/Lighting.md
index fd7df00..1e0f644 100644
--- a/03-UnrealEngine/Rendering/RenderingPipeline/Lighting/Lighting.md
+++ b/03-UnrealEngine/Rendering/RenderingPipeline/Lighting/Lighting.md
@@ -672,8 +672,10 @@ FLightAccumulator AccumulateDynamicLighting(
 			}
 
 			Lighting.Specular *= LightData.SpecularScale;
-				
+
+			//累加Diffuse + Specular光照结果（Diffuse项还会作为散射进行计算，根绝散射模式不同赋予 FLightAccumulator.ScatterableLightLuma 或者 FLightAccumulator.ScatterableLight）
 			LightAccumulator_AddSplit( LightAccumulator, Lighting.Diffuse, Lighting.Specular, Lighting.Diffuse, MaskedLightColor * Shadow.SurfaceShadow, bNeedsSeparateSubsurfaceLightAccumulation );
+			//散射项计算
 			LightAccumulator_AddSplit( LightAccumulator, Lighting.Transmission, 0.0f, Lighting.Transmission, MaskedLightColor * Shadow.TransmissionShadow, bNeedsSeparateSubsurfaceLightAccumulation );
 
 			LightAccumulator.EstimatedCost += 0.4f;		// add the cost of the lighting computations (should sum up to 1 form one light)