diff --git a/03-UnrealEngine/Rendering/RenderFeature/ShaderWorldPlugin/ShaderWorld.md b/03-UnrealEngine/Rendering/RenderFeature/ShaderWorldPlugin/ShaderWorld.md
index 9add123..999a64d 100644
--- a/03-UnrealEngine/Rendering/RenderFeature/ShaderWorldPlugin/ShaderWorld.md
+++ b/03-UnrealEngine/Rendering/RenderFeature/ShaderWorldPlugin/ShaderWorld.md
@@ -57,6 +57,8 @@ rating: ⭐
 	- TerrainAndSpawnablesManagement()
 
 ### ReadbacksManagement()
+主要用于回读RetrieveHeightAt()调用后GPU计算出来的Position信息。在**用于计算HeightReadBack的渲染线程、RHI、GPU都执行完成**后，从ReadBackHeightData的像素点（最多25个）中读取Z轴信息，之后和PointsPendingReadBacks中的X、Y轴信息合并成一个Vector3 Position。
+
 - ThreadSafe
 	 - bool
 		 - **bProcessingHeightRetrieval**