diff --git a/Something-you-can-try/Run Windows3.1/README.md b/Something-you-can-try/Run Windows3.1/README.md
index 85dd193..2416120 100644
--- a/Something-you-can-try/Run Windows3.1/README.md	
+++ b/Something-you-can-try/Run Windows3.1/README.md	
@@ -1,2 +1,11 @@
+### First, download dosbox app by
+
+```sh
+sudo apt-get install dosbox
+```
+
+
+
+
 ![pic1](https://github.com/ZitaoTech/Hackberry-Pi_Zero/blob/main/Something-you-can-try/Run%20Windows3.1/win3.1_1.jpg)
 ![pic2](https://github.com/ZitaoTech/Hackberry-Pi_Zero/blob/main/Something-you-can-try/Run%20Windows3.1/win3.1_2.jpg)