diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,3 +1,9 @@
 # mimajingsai_3
 
-张栩嫣周子怡徐思琦密码竞赛项目
\ No newline at end of file
+张栩嫣周子怡徐思琦密码竞赛项目
+
+## How to Compile
+
+```bash
+gcc ChaCha20_DRBG.c -o chacha -lm
+```