diff --git a/TeX-support.md b/TeX-support.md
index 345b399..dadf759 100644
--- a/TeX-support.md
+++ b/TeX-support.md
@@ -3,6 +3,14 @@ You can write math by TeX. With $$ and $$$, write some equations.
 ```
 # TeX support
 $$$ 1 + \frac{q^2}{(1-q)}+\frac{q^6}{(1-q)(1-q^2)}+\cdots = \prod_{j=0}^{\infty}\frac{1}{(1-q^{5j+2})(1-q^{5j+3})}, \quad\quad \text{for }\lvert q\rvert<1. $$$
+
+## inline math
+This is $$\begin{Bmatrix}
+   a & b \\
+   c & d
+\end{Bmatrix}$$ a matrix
 ```
 
-![image](https://user-images.githubusercontent.com/11307908/31156444-5753ad3a-a8ef-11e7-98aa-7b5cbe3a3403.png)
+![image](https://user-images.githubusercontent.com/11307908/32276970-3d464576-bf54-11e7-8d67-79110dcffdd8.png)
+
+Refer https://khan.github.io/KaTeX/function-support.html for more information about what functions you can write.
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