diff --git a/std/std.internet.pdl b/std/std.internet.pdl
index 2c7fc0601d3cb7ef441d6919876e6ee4d537d097..fa94ba6f198e11b59fa2ad744d3904bed4d79fc6 100644
--- a/std/std.internet.pdl
+++ b/std/std.internet.pdl
@@ -1,5 +1,11 @@
 #module std.internet
 
-primitive tcp_client(u8[] ip, u16 port, in<u8[]> tx, out<u8[]> rx) {
+union Cmd {
+    Send(u8[]),
+    Receive,
+    Finish,
+}
+
+primitive tcp_client(u8[] ip, u16 port, in<Cmd> cmds, out<u8[]> rx) {
     #builtin
 }
\ No newline at end of file