diff --git a/docker/Dockerfile.py b/docker/Dockerfile.py
index 219663cd32..038f85eb51 100644
--- a/docker/Dockerfile.py
+++ b/docker/Dockerfile.py
@@ -110,8 +110,9 @@ def heredoc(s):
     # Find a repo with a Mesos build.
     # This one was archived like:
     # mkdir mesos-repo && cd mesos-repo
-    # wget --recursive --restrict-file-names=windows -k --convert-links --no-parent --page-requisites https://rpm.aventer.biz/Ubuntu/ https://www.aventer.biz/assets/support_aventer.asc https://rpm.aventer.biz/README.txt
+    # wget --recursive --restrict-file-names=windows -k --convert-links --no-parent --page-requisites -m https://rpm.aventer.biz/Ubuntu/ https://www.aventer.biz/assets/support_aventer.asc https://rpm.aventer.biz/README.txt
     # ipfs add -r .
+    # It contains a GPG key that will expire 2026-09-28
     RUN echo "deb https://public.gi.ucsc.edu/~anovak/outbox/toil/ipfs/QmeaErHzK4Dajz2mCMd36eUDQp7GX2bSECVRpGfrqdragR/rpm.aventer.biz/Ubuntu/focal focal main" \
         > /etc/apt/sources.list.d/mesos.list \
         && curl https://public.gi.ucsc.edu/~anovak/outbox/toil/ipfs/QmeaErHzK4Dajz2mCMd36eUDQp7GX2bSECVRpGfrqdragR/www.aventer.biz/assets/support_aventer.asc | apt-key add -