diff --git a/config.pbtxt b/config.pbtxt
index 861a5a7..2497e4a 100644
--- a/config.pbtxt
+++ b/config.pbtxt
@@ -11,6 +11,11 @@ input [
 ]
 
 output [
+  {
+    name: "modify"
+    data_type: TYPE_STRING
+    dims: [ -1 ]
+  }
 ]