diff --git a/bin/ovpn_genconfig b/bin/ovpn_genconfig
index 8df36d0..ca21514 100755
--- a/bin/ovpn_genconfig
+++ b/bin/ovpn_genconfig
@@ -226,7 +226,7 @@ done
 [ ${#TMP_DNS_SERVERS[@]} -gt 0 ] && OVPN_DNS_SERVERS=("${TMP_DNS_SERVERS[@]}")
 
 # Server name is in the form "udp://vpn.example.com:1194"
-if [[ "$OVPN_SERVER_URL" =~ ^((udp|tcp)://)?([0-9a-zA-Z\.\-]+)(:([0-9]+))?$ ]]; then
+if [[ "${OVPN_SERVER_URL:-}" =~ ^((udp|tcp)://)?([0-9a-zA-Z\.\-]+)(:([0-9]+))?$ ]]; then
     OVPN_PROTO=${BASH_REMATCH[2]};
     OVPN_CN=${BASH_REMATCH[3]};
     OVPN_PORT=${BASH_REMATCH[5]};
diff --git a/docs/faqs.md b/docs/faqs.md
index 2247075..193943f 100644
--- a/docs/faqs.md
+++ b/docs/faqs.md
@@ -15,6 +15,11 @@ If it was all in one container, an upgrade would require a few steps to extract
 
 ## How do I set up a split tunnel?
 
-Split tunnels are configurations where only some of the traffic from a client goes to the VPN, with the remainder routed through the normal non-VPN interfaces. You'll want to disable a default route (-d) when you generate the configuration, but still use NAT (-N) to keep network address translation enabled. 
+Split tunnels are configurations where only some of the traffic from a client goes to the VPN, with the remainder routed through the normal non-VPN interfaces. You'll want to disable a default route (-d) when you generate the configuration, but still use NAT (-N) to keep network address translation enabled.
 
     ovpn_genconfig -N -d ...
+
+## I need to add some extra configurations to openvpn.conf, How can I do that ?
+
+You can pass multiple '-e' options to ovpn_genconfig. For example, if you need to add 'duplicate-cn' and 'topology subnet' to the server configuration you could do something like this:
+    ovpn_genconfig -e 'duplicate-cn' -e 'topology subnet' -u udp://VPN.SERVERNAME.COM