diff --git a/std/std.internet.pdl b/std/std.internet.pdl
index 3e016622c4f8586d89ec371eb4e778dcc28f719e..6d5d355696eba8591b4f7fb5d8ce21971eccc4a9 100644
--- a/std/std.internet.pdl
+++ b/std/std.internet.pdl
@@ -1,12 +1,26 @@
 #module std.internet
 
-union Cmd {
+union ClientCmd {
     Send(u8[]),
     Receive,
     Finish,
     Shutdown,
 }
 
-primitive tcp_client(u8[] ip, u16 port, in<Cmd> cmds, out<u8[]> rx) {
+comp tcp_client(u8[] ip, u16 port, in<ClientCmd> cmds, out<u8[]> rx) {
     #builtin
 }
+
+union ListenerCmd {
+    Accept,
+    Shutdown,
+}
+
+struct TcpConnection {
+    out<ClientCmd> tx,
+    in<u8[]> rx,
+}
+
+comp tcp_listener(u8[] ip, u16 port, in<ListenerCmd> cmds, out<TcpConnection> rx) {
+    #builtin
+}
\ No newline at end of file