diff --git a/deploy/files/usr/local/lib/systemd/system/l4d2-build.slice b/deploy/files/usr/local/lib/systemd/system/l4d2-build.slice
index 34c1af3..9f8aa7f 100644
--- a/deploy/files/usr/local/lib/systemd/system/l4d2-build.slice
+++ b/deploy/files/usr/local/lib/systemd/system/l4d2-build.slice
@@ -1,3 +1,4 @@
+# Perf baseline — see docs/superpowers/specs/2026-05-09-l4d2-server-host-perf-baseline-design.md
 [Unit]
 Description=left4me script-sandbox build slice
 Before=slices.target
diff --git a/deploy/files/usr/local/lib/systemd/system/l4d2-game.slice b/deploy/files/usr/local/lib/systemd/system/l4d2-game.slice
index f7284df..0770bf8 100644
--- a/deploy/files/usr/local/lib/systemd/system/l4d2-game.slice
+++ b/deploy/files/usr/local/lib/systemd/system/l4d2-game.slice
@@ -1,3 +1,4 @@
+# Perf baseline — see docs/superpowers/specs/2026-05-09-l4d2-server-host-perf-baseline-design.md
 [Unit]
 Description=left4me game-server slice
 Before=slices.target