diff --git a/TODO b/TODO
index 9ed4530d67..fd8099ea52 100644
--- a/TODO
+++ b/TODO
@@ -839,7 +839,6 @@ Features:
    - add functions to set previously stored IPv6 addresses on startup and get
      them at shutdown; store them in client->ia_na
    - write more test cases
-   - implement and do duplicate address detection, see rfc 4862, 5.4.
    - implement reconfigure support, see 5.3., 15.11. and 22.20.
    - implement support for temporary adressess (IA_TA)
    - implement dhcpv6 authentication