diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5e6a39b..5e1837e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -62,4 +62,4 @@ jobs:
         upload_url: ${{ steps.create_release.outputs.upload_url }} # This pulls from the CREATE RELEASE step above, referencing it's ID to get its outputs object, which include a `upload_url`. See this blog post for more info: https://jasonet.co/posts/new-features-of-github-actions/#passing-data-to-future-steps 
         asset_path: ./${{ env.REPOSITORY_NAME }}_${{ env.DATETIME }}.zip
         asset_name: ${{ env.REPOSITORY_NAME }}_${{ env.DATETIME }}.zip
-        asset_content_type: application/unknown
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+        asset_content_type: application/zip
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diff --git a/Dockerfile b/Dockerfile
index 1fcc684..080eec7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,3 +1,3 @@
-FROM wiiuenv/devkitppc:20211106
+FROM wiiuenv/devkitppc:20211229
 
 WORKDIR project
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diff --git a/README.md b/README.md
index 25b67c9..047c425 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,20 @@
 # AutobootModule
+
+## Building using the Dockerfile
+
+It's possible to use a docker image for building. This way you don't need anything installed on your host system.
+
+```
+# Build docker image (only needed once)
+docker build . -t autobootmodule-builder
+
+# make 
+docker run -it --rm -v ${PWD}:/project autobootmodule-builder make
+
+# make clean
+docker run -it --rm -v ${PWD}:/project autobootmodule-builder make clean
+```
+
+## Credits
+- GaryOderNichts
+- Maschell
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