diff --git a/include/types/connection.h b/include/types/connection.h
index f6a7d1b..165a683 100644
--- a/include/types/connection.h
+++ b/include/types/connection.h
@@ -331,6 +331,12 @@
 	int (*add_xprt)(struct connection *conn, void *xprt_ctx, void *toadd_ctx, const struct xprt_ops *toadd_ops, void **oldxprt_ctx, const struct xprt_ops **oldxprt_ops); /* Add a new XPRT as the new xprt, and return the old one */
 };
 
+enum mux_ctl_type {
+	MUX_STATUS, /* Expects an int as output, sets it to a combinaison of MUX_STATUS flags */
+};
+
+#define MUX_STATUS_READY (1 << 0)
+
 /* mux_ops describes the mux operations, which are to be performed at the
  * connection level after data are exchanged with the transport layer in order
  * to propagate them to streams. The <init> function will automatically be
@@ -359,6 +365,7 @@
 	void (*destroy)(void *ctx); /* Let the mux know one of its users left, so it may have to disappear */
 	void (*reset)(struct connection *conn); /* Reset the mux, because we're re-trying to connect */
 	const struct cs_info *(*get_cs_info)(struct conn_stream *cs); /* Return info on the specified conn_stream or NULL if not defined */
+	int (*ctl)(struct connection *conn, enum mux_ctl_type mux_ctl, void *arg); /* Provides informations about the mux */
 	unsigned int flags;                           /* some flags characterizing the mux's capabilities (MX_FL_*) */
 	char name[8];                                 /* mux layer name, zero-terminated */
 };