diff --git a/net/slirp.c b/net/slirp.c
index 4ec989b..a8fd9e6 100644
--- a/net/slirp.c
+++ b/net/slirp.c
@@ -885,6 +885,7 @@
 
 static int slirp_guestfwd(SlirpState *s, const char *config_str, Error **errp)
 {
+    /* TODO: IPv6 */
     struct in_addr server = { .s_addr = 0 };
     struct GuestFwd *fwd;
     const char *p;