diff --git a/Containerfile.splitter b/Containerfile.splitter
new file mode 100644
index 0000000..0b9705f
--- /dev/null
+++ b/Containerfile.splitter
@@ -0,0 +1,16 @@
+# This file is used to split existing images using `buildah build`. See
+# README.md for how to use it.
+
+ARG CHUNKAH=quay.io/coreos/chunkah:latest@sha256:ff8b8b466a942ec6000445d4001fc661e2fc5a952ad9ee29b4de9ab09d1d1708
+ARG CHUNKAH_ARGS=""
+ARG CHUNKAH_CONFIG_STR
+
+FROM overridden AS target
+FROM ${CHUNKAH} AS chunkah
+ARG CHUNKAH_CONFIG_STR
+ARG CHUNKAH_ARGS
+RUN --mount=type=bind,target=/run/src,rw \
+    --mount=from=target,target=/chunkah,ro \
+      chunkah build ${CHUNKAH_ARGS} --output oci:/run/src/out
+
+FROM oci:out
\ No newline at end of file