diff --git a/std/std.internet.pdl b/std/std.internet.pdl
index 3e016622c4f8586d89ec371eb4e778dcc28f719e..ea2f6078695f9c8dd8c2aae3490107cd5848fb86 100644
--- a/std/std.internet.pdl
+++ b/std/std.internet.pdl
@@ -10,3 +10,12 @@ union Cmd {
 primitive tcp_client(u8[] ip, u16 port, in<Cmd> cmds, out<u8[]> rx) {
     #builtin
 }
+
+struct TcpConnection {
+    in<Cmd> tx,
+    out<u8[]> rx,
+}
+
+/* primitive tcp_listener(u8[] ip, u16 port, out<TcpConnection> rx) {
+    #builtin
+} */
\ No newline at end of file