diff --git a/ansible/inventories/devnet-7/host_vars/buildoor-lighthouse-geth-1.yaml b/ansible/inventories/devnet-7/host_vars/buildoor-lodestar-ethrex-1.yaml
similarity index 71%
rename from ansible/inventories/devnet-7/host_vars/buildoor-lighthouse-geth-1.yaml
rename to ansible/inventories/devnet-7/host_vars/buildoor-lodestar-ethrex-1.yaml
index d449a42..6420e4a 100644
--- a/ansible/inventories/devnet-7/host_vars/buildoor-lighthouse-geth-1.yaml
+++ b/ansible/inventories/devnet-7/host_vars/buildoor-lodestar-ethrex-1.yaml
@@ -3,6 +3,12 @@
 # (ethpandaops/buildoor#147) on this builder only — the other three buildoors
 # stay on default_tooling_images.buildoor (main-latest).
 #
+# On THIS host on purpose: the scenario needs a builder that actually wins bids.
+# lodestar-ethrex and prysm-ethrex do; lighthouse-geth currently does not (its
+# bids are rejected with `InvalidGasLimit`, fix pending), so a canary there could
+# never win slot 31 and so could never withhold it. prysm-ethrex stays on
+# main-latest as the winning control.
+#
 # What it adds: a rule can repeat a slot plan on the same slot index of every
 # epoch, so "win slot 31 and withhold its payload" holds for the whole devnet
 # run instead of a bounded slot list. The image alone changes no behaviour —
@@ -13,5 +19,5 @@
 # Moving tag on purpose: this host is in the watchtower list, so new pushes to
 # the PR branch (with the `build-docker-image` label) roll out here automatically.
 # Revert = delete this file and re-run with `--tags buildoor --limit
-# buildoor-lighthouse-geth-1`.
+# buildoor-lodestar-ethrex-1`.
 buildoor_container_image: ethpandaops/buildoor:qu0b-action-plan-recurring-rules-latest