diff --git a/userspace/falco/falco_output.proto b/userspace/falco/falco_output.proto
index 1add401e..7719f527 100644
--- a/userspace/falco/falco_output.proto
+++ b/userspace/falco/falco_output.proto
@@ -7,6 +7,8 @@ service falco_output_service {
 }
 
 message falco_output_request {
+  string duration = 1; // TODO(leodido, fntlnz): not handled yet but keeping for reference.
+  bool keepalive = 2;
 }
 
 enum priority {
@@ -34,4 +36,4 @@ message falco_output_response {
   string format = 6;
   string output = 7;
   map<string, string> output_fields = 8;
-}
\ No newline at end of file
+}