diff --git a/latex/readme.md b/latex/readme.md
index 87c487d..d4d700a 100644
--- a/latex/readme.md
+++ b/latex/readme.md
@@ -1,6 +1,10 @@
-
 http://mohu.org/zh/
 
+
+* https://oi-wiki.org/tools/latex/
+* https://github.com/xinychen/latex-cookbook
+* https://zilutian.github.io/latex-tutorial-chinese/
+
 ---
 
 * http://mohu.org/info/symbols/symbols.htm