update building rocketmq dashboard docs
diff --git a/README.md b/README.md
index d89aaab..0c6ef3f 100644
--- a/README.md
+++ b/README.md
@@ -113,9 +113,9 @@
 ## 4. Generate a RocketMQ Dashboard Docker image
 - 4.1 build command
 ```
-sh image-build/build-image-dashboard.sh `VERSION` centos
+cd image-build && sh build-image-dashboard.sh `VERSION` centos
 
-demo: sh image-build/build-image-dashboard.sh 1.0.0 centos
+demo: sh build-image-dashboard.sh 1.0.0 centos
 ```
 
 - 4.2 start command