diff --git a/cartesi-machine.proto b/cartesi-machine.proto
index 446506b..ef7f0d1 100644
--- a/cartesi-machine.proto
+++ b/cartesi-machine.proto
@@ -174,6 +174,8 @@ message ProcessorConfig {
 message ROMConfig {
     string bootargs = 1;
     string image_filename = 2;
+    string init = 3;
+    string entrypoint = 4;
 }
 
 message RAMConfig {