diff --git a/docs/add-ons/tutorial.md b/docs/add-ons/tutorial.md
index d08af638..dc6535cc 100644
--- a/docs/add-ons/tutorial.md
+++ b/docs/add-ons/tutorial.md
@@ -109,6 +109,9 @@ To do this, we will need to update our files as follows:
 Add to your `Dockerfile` before `RUN`:
 
 ```dockerfile
+ARG BUILD_FROM
+FROM $BUILD_FROM
+
 # Install requirements for add-on
 RUN apk add --no-cache python3