diff --git a/usr.sbin/sysinstall/install.cfg b/usr.sbin/sysinstall/install.cfg
index d894f0619ae..ad53f8e0e7a 100644
--- a/usr.sbin/sysinstall/install.cfg
+++ b/usr.sbin/sysinstall/install.cfg
@@ -20,6 +20,7 @@ netmask=255.255.255.240
 ################################
 # Which installation device to use - ftp is pointed directly at my local
 # machine and the installation device is my WD8013 ethernet interface.
+# netDev can be set to ANY or a comma-delimited list of interfaces.
 _ftpPath=ftp://time.cdrom.com/pub
 netDev=ed0
 mediaSetFTP