diff --git a/src/w5500.rs b/src/w5500.rs
index a3e182b..4bf2d95 100644
--- a/src/w5500.rs
+++ b/src/w5500.rs
@@ -51,6 +51,7 @@ impl<SpiBus: ActiveBus, NetworkImpl: Network> W5500<SpiBus, NetworkImpl> {
     }
 
     pub fn open_udp_socket<SocketImpl: Socket>(&self, socket: SocketImpl) -> UdpSocket<SocketImpl> {
+        // TODO compare socket to sockets list
         UdpSocket::new(socket)
     }
 }