diff --git a/perl-xCAT/xCAT/Utils.pm b/perl-xCAT/xCAT/Utils.pm
index efc07584b..dea0a269a 100644
--- a/perl-xCAT/xCAT/Utils.pm
+++ b/perl-xCAT/xCAT/Utils.pm
@@ -2097,7 +2097,7 @@ sub get_ServiceNode
 #-----------------------------------------------------------------------------
 sub toIP
 {
-
+    # does not support IPV6  IPV6TODO
     if ($_[0] =~ /^(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})$/)
     {
         return ([0, $_[0]]);