diff --git a/latex/readme.md b/latex/readme.md
index a57fda8..c30be22 100644
--- a/latex/readme.md
+++ b/latex/readme.md
@@ -1,6 +1,7 @@
 http://mohu.org/zh/
 
 
+* http://tug.ctan.org/info/install-latex-guide-zh-cn/install-latex-guide-zh-cn.pdf
 * https://oi-wiki.org/tools/latex/
 * https://github.com/xinychen/latex-cookbook
 * https://zilutian.github.io/latex-tutorial-chinese/