diff --git a/protos/IncomingPushMessageSignal.proto b/protos/IncomingPushMessageSignal.proto
index df355318d..5591083f2 100644
--- a/protos/IncomingPushMessageSignal.proto
+++ b/protos/IncomingPushMessageSignal.proto
@@ -84,6 +84,7 @@ message SyncMessage {
 
   message Contacts {
     optional AttachmentPointer blob = 1;
+    optional bool              isComplete = 2 [default = false];
   }
 
   message Groups {