diff --git a/hosts/mars/configuration.nix b/hosts/mars/configuration.nix
index 9319f1d..40f001e 100644
--- a/hosts/mars/configuration.nix
+++ b/hosts/mars/configuration.nix
@@ -38,8 +38,12 @@
       "file_mode=0770"
       "dir_mode=0770"
       "nofail"
-      "x-systemd.automount"
-      "x-systemd.idle-timeout=60"
+      "x-systemd.automount"    # lazy-mount so boot doesn't stall if jupiter's down
+      # NO idle-timeout here (unlike terra's equivalent mount): hermes-agent's
+      # podman-hermes-agent.service RequiresMountsFor this path, so an idle
+      # auto-unmount tears the container down with it — confirmed the hard
+      # way, it killed the service ~60-70s after every start with no crash
+      # or error, just "Unmounting /mnt/jupiter" right before the stop.
       "x-systemd.mount-timeout=10s"
       "_netdev"
     ];