diff --git a/README.md b/README.md
index 643e749..71f3e56 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@ We've generated a new product of the whole Pearl River Delta region (9+2 cities)
 - Used the Sentinel-2 composite images from 2018-2019 to generate the LCZ map, so the mosaic effect is reduced to a minimum. 
 - Included the whole administrative area of the following cities: Guangzhou, Foshan, Zhaoqing, Shenzhen, Dongguan, Huizhou, Zhongshan, Jiangmen, Zhuhai, Macau, and Hong Kong (广州，佛山，肇庆，深圳，东莞，惠州，中山，江门，珠海，澳门，香港) 
 
-#### Pearl River Delta (The Greater Bay Area)
+#### Pearl River Delta (The Greater Bay Area, old version)
 Tiff file is available [here](https://sjliu.me/lcz/data/release_lcz_prd.zip) (only core urban areas included)
 
 ![Pearl River Delta (The Greater Bay Area)](/data/lczmap_prd.png)