done
## Fill in the black holes in the network. Some of these might actually be
-## known networks, so don't fill those in again.
+## known networks, so don't fill those in again. See RFC5735 or its
+## successors.
for addr in \
10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 \
127.0.0.0/8 \