diff --git a/README.md b/README.md
index 614636b..c172f2a 100644
--- a/README.md
+++ b/README.md
@@ -2,9 +2,13 @@
 
 ## Building packages
 
-The recommended way for building the packages is Docker:
+The recommended way for building the packages is Docker.
 
-```
-docker build -t builder .
-docker run --rm -v "$(pwd):/pwd" -v "$(pwd)/out:/mnt/alpine" -w "/pwd" builder build.sh
+Setup:
+- ensure that you have the private key in `.abuild/`
+- build the image using `docker build -t builder .`
+- sync the current repo to a directory called `out`
+
+```bash
+docker run --rm -it -v "$(pwd):/pwd" -v "$(pwd)/out:/mnt/alpine" -w "/pwd" builder build.sh
 ```