diff --git a/README.md b/README.md
index 6747438..31f2252 100644
--- a/README.md
+++ b/README.md
@@ -14,11 +14,11 @@ It combines a smart Linux distribution ([NixOS](https://nixos.org/)) with modern
 
 ## Planned initial features
 
-- Firewall
+- Firewall ([netfilter](https://netfilter.org/))
   - [ ] NAT
   - [ ] Rules
   - [ ] UPnP
-- [ ] DynDNS
+- [ ] DynDNS ([ddclient](https://ddclient.net/))
 - VPN
   - [ ] [OpenVPN](https://openvpn.net/)
   - [ ] [Wireguard](https://www.wireguard.com/)