diff --git a/README.md b/README.md
index 2eca77e..7ba67b1 100644
--- a/README.md
+++ b/README.md
@@ -23,7 +23,7 @@ A searchable package list is available on [openwrt.org](https://openwrt.org/pack
 
 ## Configure
 
-Configuration is performed using a config file, `.env`. Values read from this file at runtime are used to generate OpenWRT format config files.
+Configuration is performed using a config file, `openwrt.conf`. Values read from this file at runtime are used to generate OpenWRT format config files.
 
 To add or change a configuration, modify the config templates in `etc/config/<section>.tpl`.
 
diff --git a/run.sh b/run.sh
index fa8b8c6..3d8dd87 100755
--- a/run.sh
+++ b/run.sh
@@ -1,13 +1,16 @@
 #!/bin/bash
 # set -x 
 
-source openwrt.conf || { echo 'no config file found! use openwrt.conf.example for inspiration'; exit 1; }
 
 function _usage() {
-  echo "$0 [interface_name]"
+  echo "Could not find config file."
+  echo "Usage: $0 [/path/to/openwrt.conf]"
   exit 1
 }
 
+CONFIG_FILE=${1:-"openwrt.conf"}
+source $CONFIG_FILE 2>/dev/null || { _usage; exit 1; }
+
 function _nmcli() {
   type nmcli >/dev/null 2>&1
   if [[ $? -eq 0 ]]; then