diff --git a/man/man8/ip-mptcp.8 b/man/man8/ip-mptcp.8
index 6c708957..89fcb64f 100644
--- a/man/man8/ip-mptcp.8
+++ b/man/man8/ip-mptcp.8
@@ -135,6 +135,14 @@ established MPTCP sockets will be accepted on the specified port, regardless
 the original listener port accepting the first MPTCP subflow and/or
 this peer being actually on the client side.
 
+.TP
+.IR IFNAME
+is the network interface name attached to the endpoint. It is important to
+specify this device name linked to the address to make sure the system knows how
+to route packets from the specified IP address to the correct network interface.
+Without this, it might be required to add IP rules and routes to have the
+expected behavior.
+
 .TP
 .IR ID
 is a unique numeric identifier for the given endpoint