diff --git a/src/udp_wrap.cc b/src/udp_wrap.cc
index 30113b7a8e3201..4d6b2377ec5014 100644
--- a/src/udp_wrap.cc
+++ b/src/udp_wrap.cc
@@ -255,7 +255,7 @@ void UDPWrap::DoSend(const FunctionCallbackInfo<Value>& args, int family) {
                           args.Holder(),
                           args.GetReturnValue().Set(UV_EBADF));
 
-  // send(req, list, port, address, hasCallback)
+  // send(req, list, list.length, port, address, hasCallback)
   CHECK(args[0]->IsObject());
   CHECK(args[1]->IsArray());
   CHECK(args[2]->IsUint32());