diff --git a/README.md b/README.md
index 7de5857..a676789 100644
--- a/README.md
+++ b/README.md
@@ -3,8 +3,7 @@
 Simple helper for turning on/off connected/disconnected monitors with `xrandr`.
 
 ## Usage
-
-`swm [monitor-1...montior-n]` e.g. `swm LVDS1 HDMI1`
+`swm [monitor-1...montior-n] [--postCmd="cmd"]` e.g. `swm LVDS1 HDMI1`
 
 If `monitor-1` to `monitor-n` is specified `swm` will turn on these monitors
 and place them from left to right in the order given. If a provided monitor is
@@ -13,6 +12,23 @@ not connected it will be skipped.
 If no monitors are specified all connected monitors will be turned on and
 placed from left to right in alphabetical order of their name.
 
+If `--postCmd` is given, this command is executed after switching the monitors.
+This is usefull to tell your window manager to re-detect monitors, e.g. for
+herbstluftwm `herbstclient reload`.
+
+`swm -l` or `swm --list`
+
+List all devices with the connectivity status.
+
+The configuration can be placed in `$XDG_CONFIG_HOME/switchmon/config.json` in
+the form of
+
+```
+{
+    "postCmd": "some command"
+}
+```
+
 ## Requirements
 
 Node.js > 4.x on your PATH.
diff --git a/cli.js b/cli.js
index b59218c..ac732f1 100755
--- a/cli.js
+++ b/cli.js
@@ -3,6 +3,8 @@
 
 const argv = require('minimist')(process.argv.slice(2));
 const swm = require('./swm.js');
+const config = require('./config.js');
+const postCmd = argv.postCmd || config.postCmd;
 
 if (argv.help || argv.h) {
     console.log(
@@ -10,7 +12,7 @@ if (argv.help || argv.h) {
 
 Usage:
 
-'swm [monitor-1...montior-n]' e.g. 'swm LVDS1 HDMI1'
+'swm [monitor-1...montior-n] [--postCmd="cmd"]' e.g. 'swm LVDS1 HDMI1'
 
 If 'monitor-1' to 'monitor-n' is specified 'swm' will turn on these monitors
 and place them from left to right in the order given. If a provided monitor is
@@ -19,9 +21,21 @@ not connected it will be skipped.
 If no monitors are specified all connected monitors will be turned on and
 placed from left to right in alphabetical order of their name.
 
+If "--postCmd" is given, this command is executed after switching the monitors.
+This is usefull to tell your window manager to re-detect monitors, e.g. for
+herbstluftwm "herbstclient reload".
+
 'swm -l' or 'swm --list'
 
-List all devices with the connectivity status.`
+List all devices with the connectivity status.
+
+The configuration can be placed in "$XDG_CONFIG_HOME/switchmon/config.json" in
+the form of
+
+{
+    "postCmd": "some command"
+}`
+
     );
 
     process.exit(2);
@@ -40,7 +54,7 @@ if (argv.list || argv.l) {
     swm.getDevices()
         .then(swm.generateXrandrOptions.bind(null, argv._))
         .then(swm.switchDevices)
-        .then(swm.executePostCmd.bind(null, argv.postCmd))
+        .then(swm.executePostCmd.bind(null, postCmd))
         .catch(err => {
             console.error(err);
         });
diff --git a/config.js b/config.js
new file mode 100644
index 0000000..c402929
--- /dev/null
+++ b/config.js
@@ -0,0 +1,17 @@
+'use strict';
+
+const configPath = require('xdg').basedir.configPath('switchmon/config.json');
+
+const defaults = {
+    postCmd: undefined,
+};
+
+let config = Object.assign({}, defaults);
+
+try {
+    config = Object.assign(config, require(configPath));
+} catch(err) {
+    // No config found in "${configPath}". Using defaults...
+}
+
+module.exports = config;
diff --git a/package.json b/package.json
index c89bb82..ab3aecb 100644
--- a/package.json
+++ b/package.json
@@ -6,7 +6,9 @@
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"
   },
-  "bin" : { "swm" : "./cli.js" },
+  "bin": {
+    "swm": "./cli.js"
+  },
   "repository": {
     "type": "git",
     "url": "git+https://github.com/tomru/switchmon.git"
@@ -23,6 +25,7 @@
   "homepage": "https://github.com/tomru/switchmon#readme",
   "dependencies": {
     "minimist": "^1.2.0",
+    "xdg": "^0.1.1",
     "xrandr-parse": "^0.1.1"
   }
 }