diff --git a/cargo/diagram.json b/cargo/diagram.json
index 8cc2512..f6ce21c 100644
--- a/cargo/diagram.json
+++ b/cargo/diagram.json
@@ -15,6 +15,7 @@
     ],
     "connections": [
         [
+            "esp:TX",
             "$serialMonitor:RX",
             "",
             []