diff --git a/massa-node/base_config/openrpc.json b/massa-node/base_config/openrpc.json
index 467c50a5f70..b3363457aa9 100644
--- a/massa-node/base_config/openrpc.json
+++ b/massa-node/base_config/openrpc.json
@@ -2742,6 +2742,10 @@
                     "chain_id": {
                         "description": "Chain id",
                         "type": "number"
+                    },
+                    "minimal_fees": {
+                        "description": "Minimal fees to include operation in a block",
+                        "type": "string"
                     }
                 },
                 "additionalProperties": false