diff --git a/include/proto/stream_interface.h b/include/proto/stream_interface.h
index 46df1bd..7202443 100644
--- a/include/proto/stream_interface.h
+++ b/include/proto/stream_interface.h
@@ -45,7 +45,8 @@
 int conn_si_send_proxy(struct connection *conn, unsigned int flag);
 struct appctx *si_register_handler(struct stream_interface *si, struct applet *app);
 void si_applet_wake_cb(struct stream_interface *si);
-void si_update(struct stream_interface *si);
+void si_update_rx(struct stream_interface *si);
+void si_update_tx(struct stream_interface *si);
 int si_cs_recv(struct conn_stream *cs);
 struct task *si_cs_io_cb(struct task *t, void *ctx, unsigned short state);
 void si_update_both(struct stream_interface *si_f, struct stream_interface *si_b);
@@ -529,6 +530,13 @@
 	return ret;
 }
 
+/* Combines both si_update_rx() and si_update_tx() at once */
+static inline void si_update(struct stream_interface *si)
+{
+	si_update_rx(si);
+	si_update_tx(si);
+}
+
 /* Returns info about the conn_stream <cs>, if not NULL. It call the mux layer's
  * get_cs_info() function, if it exists. On success, it returns a cs_info
  * structure. Otherwise, on error, if the mux does not implement get_cs_info()