diff --git a/src/Add-on/DrawDim/DimBoards.ts b/src/Add-on/DrawDim/DimBoards.ts
index 01533542a..ba1694cbf 100644
--- a/src/Add-on/DrawDim/DimBoards.ts
+++ b/src/Add-on/DrawDim/DimBoards.ts
@@ -157,7 +157,7 @@ export class DimBoards
                 minY = Math.min(brBox.min.y, minY);
             }
 
-            //修正坐标系基点 保证在柜子的最前面
+            //修正坐标系基点 保证在柜子的最前面(因为y在上面被翻转了,所以这里是减号)
             spaceFrontCS.elements[12] -= minY * y.x;
             spaceFrontCS.elements[13] -= minY * y.y;
             spaceFrontCS.elements[14] -= minY * y.z;