--- a/xt_FULLCONENAT.c
+++ b/xt_FULLCONENAT.c
@@ -1345,9 +1345,12 @@ static struct xt_target tg_reg[] __read_
 static int __init fullconenat_tg_init(void)
 {
   int ret;
+  printk(KERN_INFO "xt_FULLCONENAT: RFC3489 Full Cone NAT module\n"
+    "xt_FULLCONENAT: Copyright (C) 2018 Chion Tang <tech@chionlab.moe>\n");
+
   wq = create_singlethread_workqueue("xt_FULLCONENAT");
   if (wq == NULL) {
-    printk("xt_FULLCONENAT: warning: failed to create workqueue\n");
+    printk(KERN_WARNING "xt_FULLCONENAT: warning: failed to create workqueue\n");
   }
 
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 2, 0)