diff --git a/libs/debian_service/proto/DebianService.proto b/libs/debian_service/proto/DebianService.proto
index 43955fa..e52b28a 100644
--- a/libs/debian_service/proto/DebianService.proto
+++ b/libs/debian_service/proto/DebianService.proto
@@ -25,6 +25,7 @@
   rpc ReportVmActivePorts (ReportVmActivePortsRequest) returns (ReportVmActivePortsResponse) {}
   rpc OpenForwardingRequestQueue (QueueOpeningRequest) returns (stream ForwardingRequestItem) {}
   rpc OpenShutdownRequestQueue (ShutdownQueueOpeningRequest) returns (stream ShutdownRequestItem) {}
+  rpc OpenStorageBalloonRequestQueue (StorageBalloonQueueOpeningRequest) returns (stream StorageBalloonRequestItem) {}
 }
 
 message QueueOpeningRequest {
@@ -52,3 +53,9 @@
 message ShutdownQueueOpeningRequest {}
 
 message ShutdownRequestItem {}
+
+message StorageBalloonQueueOpeningRequest {}
+
+message StorageBalloonRequestItem {
+  uint64 available_bytes = 1;
+}