diff --git a/protos/dmi/hw_events_mgmt_service.proto b/protos/dmi/hw_events_mgmt_service.proto
index 2a53e3e..2387420 100644
--- a/protos/dmi/hw_events_mgmt_service.proto
+++ b/protos/dmi/hw_events_mgmt_service.proto
@@ -103,6 +103,11 @@
 }
 
 message ListEventsResponse {
+    enum Reason {
+        UNDEFINED_REASON = 0;
+        UNKNOWN_DEVICE = 1;
+        INTERNAL_ERROR = 2;
+    }
     Status status = 1;
     Reason reason = 2;
     EventsCfg events = 3;
@@ -117,6 +122,12 @@
 }
 
 message EventsConfigurationResponse {
+    enum Reason {
+        UNDEFINED_REASON = 0;
+        UNKNOWN_DEVICE = 1;
+        INTERNAL_ERROR = 2;
+        INVALID_CONFIG = 3;
+    }
     Status status = 1;
     Reason reason = 2;
 }