diff --git a/src/finn/custom_op/fpgadataflow/__init__.py b/src/finn/custom_op/fpgadataflow/__init__.py
index 32c09d655efc12882e720cae0421bf93e56c30b9..3a1d65a0cc46b5cccf1e30d93517d0a40c8b7aac 100644
--- a/src/finn/custom_op/fpgadataflow/__init__.py
+++ b/src/finn/custom_op/fpgadataflow/__init__.py
@@ -73,6 +73,8 @@ class HLSCustomOp(CustomOp):
             "exec_mode": ("s", False, ""),
             "sim_cycles": ("i", False, 0),
             "rtlsim_trace": ("s", False, ""),
+            "res_estimate": ("s", False, ""),
+            "res_hls": ("s", False, ""),
         }
 
     def node_res_estimation(self):