diff --git a/readme.md b/readme.md
index e77d267..d212fcc 100644
--- a/readme.md
+++ b/readme.md
@@ -9,6 +9,20 @@ pong -k udp www.baidu.com 443
 
 pong -a www.baidu.com -p 443 -k tcp -t 3
 
+ 
+## build arm64 on oracle
+```bash
+cd /root
+rm -rf pong
+git clone https://git.sre.ink/go/pong.git
+cd pong
+CGO_ENABLED=0 GOOS=linux GOARCH=arm64 GO111MODULE=on   go mod tidy
+CGO_ENABLED=0 GOOS=linux GOARCH=arm64 GO111MODULE=on   go build -v -a -o pong pong.go
+rm -rf /usr/bin/pong
+mv pong /usr/bin/
+pong www.baidu.com 443
+```
+ 
 ## build
 ```bash
 cd /root