diff --git a/configs/README.txt b/configs/README.txt
index 176cbbe6ffc..ab27e3252af 100644
--- a/configs/README.txt
+++ b/configs/README.txt
@@ -304,7 +304,8 @@ defconfig -- This is a configuration file similar to the Linux
 		CONFIG_NET_RECEIVE_WINDOW - The size of the advertised receiver's
 		  window
 		CONFIG_NET_ARPTAB_SIZE - The size of the ARP table
-		CONFIG_NET_BROADCAST - Broadcast support
+		CONFIG_NET_BROADCAST - Incoming UDP broadcast support
+		CONFIG_NET_MULTICAST - Outgoing multi-cast address support
 		CONFIG_NET_LLH_LEN - The link level header length
 		CONFIG_NET_FWCACHE_SIZE - number of packets to remember when
 		  looking for duplicates