diff --git a/todo/nping.txt b/todo/nping.txt
index 3bc1ddbf2..fbfe10148 100644
--- a/todo/nping.txt
+++ b/todo/nping.txt
@@ -53,6 +53,9 @@
   transport level (letting the OS craft the IPv6 header), and at raw ethernet
   level. None of them seems to work well, though.
 
+* Make Nping call nsi_delete() on pcap IODs, IODs in TCP-Connect mode and maybe
+  in IODs of other modes. See http://seclists.org/nmap-dev/2010/q3/587
+
 * Consider using Nmap's proto-dependant payloads for UDP packets. According
   to his tests, better results are obtained when sending UDP probes with a
   payload specific to the protocol.