diff --git a/data/paper b/data/paper
index be1ade71..105fb69a 100644
--- a/data/paper
+++ b/data/paper
@@ -1,13 +1,14 @@
 # 常见的查文献的网站，可以走实验室的代理或者在实验室直连
+# A common literature search website can go to the laboratory's agent or directly in the laboratory.
 
-# 中国
+# site in China mainland
 wanfangdata.com.cn
 cnki.net
 las.ac.cn
 csdl.ac.cn
 cnki.net
 
-# 国外
+# site not in china mainland
 knovel.com
 newisiknowledge.com
 computingreviews.com