diff --git a/README.md b/README.md
index 5cb2e41..8554208 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,10 @@ FROM hosttoday/ht-docker-node
 This image has nvm, node and npm in PATH.
 So if you need an image with a special node version (useful for CI/CA/CD) you can do
 
-```sh
-nvm install [node_version_number]
-nvm alias default [node_version_number]
-```
\ No newline at end of file
+```Dockerfile
+FROM hosttoday/ht-docker-node
+RUN nvm install [node_version_number] \
+    && nvm alias default [node_version_number]
+```
+
+npm and node key words will now point to your selected version when you use your new image.
\ No newline at end of file