diff --git a/README.md b/README.md
index 7bc1a39..8dba60f 100644
--- a/README.md
+++ b/README.md
@@ -16,3 +16,4 @@
 * [新手安裝LaTeX懶人教學(Step by step)]( http://leavedcorn.pixnet.net/blog/post/24773932-新手安裝latex懶人教學(step-by-step))
 * [HostMath - Online LaTeX formula editor](http://www.hostmath.com)
 * [清大資工Latex教學](http://www.cs.nthu.edu.tw/~cherung/teaching/2009cs5321/link/latex.pdf)
+* [LaTeX Mathematical Symbols](http://www.auburn.edu/~tamtiny/Symbols.pdf)