diff --git a/dummy/netrigctl.c b/dummy/netrigctl.c
index 6a0f31587..e6bb84c57 100644
--- a/dummy/netrigctl.c
+++ b/dummy/netrigctl.c
@@ -530,6 +530,7 @@ static int netrigctl_open(RIG *rig)
             }
             else
             {
+                // not an error -- just a warning for backward compatibily
                 rig_debug(RIG_DEBUG_ERR, "%s: unknown setting='%s'\n", __func__, buf);
             }
         }