README: document the new promisc interface in README as well

diff --git a/README.md b/README.md
index b35845bf2a2b4e286b0671a8c1821f0f10f606a2..ae36ff68fd7b40b2bbc84537d455777c6263abc9 100644 (file)
--- a/README.md
+++ b/README.md
@@ -188,6 +188,9 @@ other solutions:
  2. Put the interface in promiscuous mode with `ip link set
     promisc on dev eth0`.
 
+The last solution can be done directly by `lldpd` (on Linux only) by
+using the option `configure system interface promiscuous`.
+
 On modern networks, the performance impact should be nonexistent.
 
 More information: