Update README.md

README.md

@@ -8,7 +8,7 @@ The PNG file name is the case_id of each WSI. Match the original TCGA name with
 
 Each annotation mask's size equals level 3 of the corresponding WSI. 
 
-**Patch Annotations of TCGA-STAD**: are saved as CSV files, each raw indicates a patch with corresponding coordinates, sizes, and annotated labels. 
+**Patch Annotations of TCGA-STAD**: are saved as CSV files, each raw indicates a patch with corresponding coordinates, sizes, (x_y_size, x and y stand for the upper left coordinate of each patch) and annotated labels. 
 
 Both coordinates and sizes are obtained at the maximum magnification of the corresponding SVS file.