diff --git a/dockerfiles/README.md b/dockerfiles/README.md
index b8105d91..3c9c995a 100644
--- a/dockerfiles/README.md
+++ b/dockerfiles/README.md
@@ -31,6 +31,9 @@ CMD ["-h"]
 # becomes "nginx -h"
 ```
 
+> #### ! Note
+>Setting `ENTRYPOINT` will remove the `CMD` instruction defined in the base image. To fix this, the `CMD` instruction must be redefined in the current image.
+
 Let's run it.
 ```bash
 docker build -t testnginx . # build image