diff --git a/shared_model/schema/commands.proto b/shared_model/schema/commands.proto
index 30c519c0e88..ebb3009dbb2 100644
--- a/shared_model/schema/commands.proto
+++ b/shared_model/schema/commands.proto
@@ -13,7 +13,7 @@ import "primitive.proto";
 message AddAssetQuantity {
     string asset_id = 1;
     string amount = 2;
-    string title = 3;
+    optional string title = 3;
 }
 
 message AddPeer {