diff --git a/Beijing PM2.5/README.md b/Beijing PM2.5/README.md
index 6dcbc8b..d7ed4fe 100644
--- a/Beijing PM2.5/README.md
+++ b/Beijing PM2.5/README.md
@@ -1,5 +1,5 @@
 Data Science Dojo <br/>
-Copyright (c) 2016 - 2019
+Copyright (c) 2019 - 2020
 
 ---