diff --git a/samples/nmap-scan.sh b/samples/nmap-scan.sh
index 137060a..c2df33e 100755
--- a/samples/nmap-scan.sh
+++ b/samples/nmap-scan.sh
@@ -11,15 +11,29 @@
 # Nmap, passing a list of all networks and hosts to be
 # scanned.
 #
+# If you have a large number of networks, use the mapfile option.
+# In order to use mapfile, populate your networks, one per line,
+# in a file called networks.txt.
+#
+# If you have a small number of networks, comment out the mapfile
+# lines, and uncomment the "small array" line.
+#
 # For the purpose of this example, assume that netbox-scanner
 # is configured to use the same directory of this script
 # to look for XML files.
 ##
 
-NETWORKS="192.168.3.0/24 192.168.252.0/24"
+# mapfile
+declare -a NETWORKS
+mapfile -t NETWORKS < samples/networks.txt
+
+# small array
+#NETWORKS="192.168.3.0/24 192.168.252.0/24"
+
+
 TODAY="$(date +%d.%m.%yT%H:%M:%S%Z)"
 
-for net in $NETWORKS; do
+for net in "${NETWORKS[@]}"; do
     NETNAME=$(echo $net | tr -s '/' '-')
     #nmap "$net" -T4 -O -F --host-timeout 30s -oX nmap-"$NETNAME".xml
     nmap "$net" -T4 -sn --host-timeout 30s -oX nmap-"$NETNAME".xml