diff --git a/Shorewall/interfaces b/Shorewall/interfaces
index 3a5fc9e13..33a01ef2b 100644
--- a/Shorewall/interfaces
+++ b/Shorewall/interfaces
@@ -178,6 +178,17 @@
 #				       in the ZONE column to include only those
 #				       hosts routed through the interface.
 #
+#			sourceroute  - If this option is not specified for an
+#				       interface, then source-routed packets
+#				       will not be accepted from that
+#				       interface (sets /proc/sys/net/ipv4/
+#				       conf/<interface>/
+#				       accept_source_route to 1).
+#				       Only set this option if you know what
+#				       you are you doing. This might represent
+#				       a security risk and is not usually
+#				       needed.
+#
 #			upnp	     - Incoming requests from this interface
 #				       may be remapped via UPNP (upnpd).
 #