diff --git a/03-UnrealEngine/Rendering/RenderingPipeline/Lighting/Lighting.md b/03-UnrealEngine/Rendering/RenderingPipeline/Lighting/Lighting.md
index f635bbe..0b6bd83 100644
--- a/03-UnrealEngine/Rendering/RenderingPipeline/Lighting/Lighting.md
+++ b/03-UnrealEngine/Rendering/RenderingPipeline/Lighting/Lighting.md
@@ -663,7 +663,7 @@ void GetShadowTerms(float SceneDepth, half4 PrecomputedShadowFactors, uint Shadi
 		half StaticShadowing = 1.0f;
 #endif
 
-		if (LightData.bRadialLight || SHADING_PATH_MOBILE)//一般是 PointLight or SpotLight。径向衰减（radial attenuation）：指光照强度随距离光源的远近而衰减的特性（通常遵循平方反比定律）。
+		if (LightData.bRadialLight || SHADING_PATH_MOBILE)//RadialLight或者是移动端使用以下逻辑。bRadialLight一般是 PointLight or SpotLight。径向衰减（radial attenuation）：指光照强度随距离光源的远近而衰减的特性（通常遵循平方反比定律）。
 		{
 			// Remapping the light attenuation buffer (see ShadowRendering.cpp)
 
@@ -682,11 +682,11 @@ void GetShadowTerms(float SceneDepth, half4 PrecomputedShadowFactors, uint Shadi
 
 			float DynamicShadowFraction = DistanceFromCameraFade(SceneDepth, LightData);
 			// For a directional light, fade between static shadowing and the whole scene dynamic shadowing based on distance + per object shadows
-			Shadow.SurfaceShadow = lerp(LightAttenuation.x, StaticShadowing, DynamicShadowFraction);
+			Shadow.SurfaceShadow = lerp(LightAttenuation.x, StaticShadowing, DynamicShadowFraction);//根据计算出动态阴影的衰减值来插值ShadowProject与静态阴影。x:方向光阴影
 			// Fade between SSS dynamic shadowing and static shadowing based on distance
-			Shadow.TransmissionShadow = min(lerp(LightAttenuation.y, StaticShadowing, DynamicShadowFraction), LightAttenuation.w);
+			Shadow.TransmissionShadow = min(lerp(LightAttenuation.y, StaticShadowing, DynamicShadowFraction), LightAttenuation.w);// w:per-object SSS shadowing
 
-			Shadow.SurfaceShadow *= LightAttenuation.z;
+			Shadow.SurfaceShadow *= LightAttenuation.z;//Light function + per-object shadows in z
 			Shadow.TransmissionShadow *= LightAttenuation.z;
 
 			// Need this min or backscattering will leak when in shadow which cast by non perobject shadow(Only for directional light)