diff --git a/images/magnum/Dockerfile b/images/magnum/Dockerfile
index 88571af..4d271ee 100644
--- a/images/magnum/Dockerfile
+++ b/images/magnum/Dockerfile
@@ -11,6 +11,7 @@
 RUN mv /${TARGETOS}-${TARGETARCH}/helm /usr/bin/helm
 
 FROM openstack-venv-builder AS build
+# renovate: name=openstack/magnum repo=https://opendev.org/openstack/magnum.git branch=unmaintained/zed
 ARG MAGNUM_GIT_REF=0ee979099a01ae2c8b1b5d6757897a8993e4e34c
 ADD --keep-git-dir=true https://opendev.org/openstack/magnum.git#${MAGNUM_GIT_REF} /src/magnum
 RUN git -C /src/magnum fetch --unshallow