diff --git a/Containerfile b/Containerfile
index 43f9bb1..0769943 100644
--- a/Containerfile
+++ b/Containerfile
@@ -1,25 +1,24 @@
 ARG FEDORA_MAJOR_VERSION=37
 
+# change this line if you want to change the image
 FROM ghcr.io/ublue-os/silverblue-main:${FEDORA_MAJOR_VERSION}
 
+# copy over configuration files
 COPY etc /etc
 # COPY usr /usr
 
 COPY ublue-firstboot /usr/bin
 COPY recipe.yml /etc/ublue-recipe.yml
 
+# yq used in build.sh and the setup-flatpaks recipe to read the recipe.yml
+# copied from the official container image as it's not avaible as an rpm
 COPY --from=docker.io/mikefarah/yq /usr/bin/yq /usr/bin/yq
 
-RUN rpm-ostree override remove firefox firefox-langpacks
-
-RUN echo "-- Installing RPMs defined in recipe.yml --" && \
-    rpm_packages=$(yq '.rpms[]' < /etc/ublue-recipe.yml) && \
-    for pkg in $rpm_packages; do \
-        echo "Installing: ${pkg}" && \
-        rpm-ostree install $pkg; \
-    done && \ 
-    echo "---"
+# copy and run the build script
+COPY build.sh /tmp/build.sh
+RUN chmod +x /tmp/build.sh && /tmp/build.sh
 
+# clean up and finalize container build
 RUN rm -rf \
         /tmp/* \
         /var/* && \
diff --git a/build.sh b/build.sh
new file mode 100644
index 0000000..45bdb84
--- /dev/null
+++ b/build.sh
@@ -0,0 +1,10 @@
+# remove the default firefox (from fedora) in favor of the flatpak
+rpm-ostree override remove firefox firefox-langpacks
+
+echo "-- Installing RPMs defined in recipe.yml --"
+rpm_packages=$(yq '.rpms[]' < /etc/ublue-recipe.yml)
+for pkg in $rpm_packages; do \
+    echo "Installing: ${pkg}" && \
+    rpm-ostree install $pkg; \
+done
+echo "---"
\ No newline at end of file