diff --git a/README.md b/README.md
index 879ca78..c319231 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,10 @@
 # simple-harbor-task
 
+Build base image:
+```sh
+docker build -t task1-image -f base.dockerfile .
+```
+
 > NOTE: `HARBOR_SKIP_AGENT_INSTALL=1` requires https://github.com/jht5945/harbor
 
 ```sh