diff --git a/signalsets/v3/default.json b/signalsets/v3/default.json
index 74edb06..844266b 100644
--- a/signalsets/v3/default.json
+++ b/signalsets/v3/default.json
@@ -1,4 +1,8 @@
-{ "commands": [
+{ "ecu": [
+    { "hdr": "7E0", "type": "engine" },
+    { "hdr": "7E1", "type": "transmission" }
+  ],
+  "commands": [
 { "hdr": "726", "dbg": true, "cmd": {"22": "FD2A"}, "freq": 1,
   "signals": [
     {"id": "LR4_BRAKE", "path": "Control", "fmt": { "len": 8, "max": 1, "unit": "scalar" }, "name": "Brake"}