diff --git a/proto/frequenz/api/common/v1/microgrid/communication_components/communication_components.proto b/proto/frequenz/api/common/v1/microgrid/communication_components/communication_components.proto
index ffe19195..a621a6b3 100644
--- a/proto/frequenz/api/common/v1/microgrid/communication_components/communication_components.proto
+++ b/proto/frequenz/api/common/v1/microgrid/communication_components/communication_components.proto
@@ -145,7 +145,7 @@ message CommunicationComponent {
 //     ```json
 //     {
 //       "diagnosticCode": "COMMUNICATION_COMPONENT_DIAGNOSTIC_CODE_CONFIGURATION_ERR",
-//       "vendorErrorCode": 1002,
+//       "vendorDiagnosticCode": 1002,
 //       "message": "VLAN mismatch detected on port 3"
 //     }
 //     ```
diff --git a/proto/frequenz/api/common/v1/microgrid/electrical_components/electrical_components.proto b/proto/frequenz/api/common/v1/microgrid/electrical_components/electrical_components.proto
index 9c3002d4..b926061a 100644
--- a/proto/frequenz/api/common/v1/microgrid/electrical_components/electrical_components.proto
+++ b/proto/frequenz/api/common/v1/microgrid/electrical_components/electrical_components.proto
@@ -416,7 +416,7 @@ message ElectricalComponentConnection {
 //     {
 //       "diagnosticCode":
 //           "ELECTRICAL_COMPONENT_DIAGNOSTIC_CODE_OVERTEMPERATURE",
-//       "vendorErrorCode": 2003,
+//       "vendorDiagnosticCode": 2003,
 //       "message": "Temperature sensor 3 reported 61.5°C (limit: 60°C)"
 //     }
 //     ```