diff --git a/proto/internal/flow.proto b/proto/internal/flow.proto
index 024c2be..708d906 100644
--- a/proto/internal/flow.proto
+++ b/proto/internal/flow.proto
@@ -8,6 +8,7 @@ import "node.proto";
 import "flow_definition.proto";
 
 message Flow {
+  int64 flow_id = 1;
   Node start_node = 2;
   FlowDefinition definition = 3;
 }
@@ -23,8 +24,9 @@ message FlowLogonRequest {
 
 //Sagittarius sends flow to be updated
 message FlowResponse {
-  Flow updated_flow = 1;
-  FlowCommandType type = 2;
+  optional Flow updated_flow = 1;  
+  optional int64 deleted_flow_id = 2;
+  FlowCommandType type = 3;
 }
 
 //All ids of flows that Aquila holds
@@ -43,4 +45,4 @@ message FlowGetResponse {
 service FlowService {
   rpc Get (FlowGetRequest) returns (FlowGetResponse) {}
   rpc Update (FlowLogonRequest) returns (stream FlowResponse) {}
-}
\ No newline at end of file
+}