diff --git a/README.md b/README.md
index 8d23882..8be92bc 100644
--- a/README.md
+++ b/README.md
@@ -9,6 +9,7 @@ A [RFC 865](https://datatracker.ietf.org/doc/html/rfc865) compliant Quote of the
 * udp client
 
 ## Todo
+* IPv6
 * t h r e a d s to accept several clients and/or run both udp and tcp servers from same executable
 * macros (#define XXX yyy) for currently hard-coded values
 * logging ?