diff --git a/.gitignore b/.gitignore
index 810b705..7521a66 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,8 +1,8 @@
 .idea
 .elasticbeanstalk
+.DS_Store
 node_modules
-region.txt
-.reload
+config.json
 *.log
 _debug*.*
 .ssl/ssl.*
\ No newline at end of file
diff --git a/.npmignore b/.npmignore
index 5a61434..5fcb973 100644
--- a/.npmignore
+++ b/.npmignore
@@ -1,6 +1,8 @@
 .idea
 .git
 .reload
+.DS_Store
+config.json
 node_modules
 npm-debug.log
 tests
diff --git a/app.js b/app.js
index 4ddc44e..51d425f 100644
--- a/app.js
+++ b/app.js
@@ -8,17 +8,6 @@
 /*
  * Configuration
  */
-// True if server should include default icons set
-const serveDefaultIcons = true;
-
-// Directories with json files for custom icon sets
-// Use simple-svg-tools package to create json collections
-const customIconDirectories = ['json'];
-
-// HTTP port
-// Run ssl.js for SSL support
-const port = process.env.PORT || 3000;
-
 // Cache configuration
 const cache = 604800, // cache time in seconds
     cacheMin = cache, // minimum cache refresh time in seconds
@@ -32,7 +21,7 @@ const fs = require('fs'),
     express = require('express'),
     app = express(),
 
-    // Debug stuff
+    // Configuration and version
     version = JSON.parse(fs.readFileSync('package.json', 'utf8')).version,
 
     // Included files
@@ -41,31 +30,40 @@ const fs = require('fs'),
     // Query parser
     parseQuery = require('./src/query');
 
-// Region file to easy identify server in CDN
-let region = '';
-if (!region.length && process.env.region) {
-    region = process.env.region;
-}
+// Configuration
+let config = JSON.parse(fs.readFileSync(__dirname + '/config-default.json', 'utf8'));
+
 try {
-    region = fs.readFileSync('region.txt', 'utf8').trim();
+    let customConfig = fs.readFileSync(__dirname + '/config.json', 'utf8');
+    if (typeof customConfig === 'string') {
+        customConfig = JSON.parse(customConfig);
+        Object.assign(config, customConfig);
+    }
 } catch (err) {
 }
-if (region.length > 10 || !region.match(/^[a-z0-9_-]+$/i)) {
-    region = '';
-}
 
-// Reload key
-let reloadKey = '';
-try {
-    reloadKey = fs.readFileSync('.reload', 'utf8').trim();
-} catch (err) {
+// Port
+if (config['env-port'] && process.env.PORT) {
+    config.port = process.env.PORT;
 }
-if (reloadKey.length < 8 || reloadKey.length > 64) {
-    reloadKey = '';
+
+// Region file to easy identify server in CDN
+if (!config['env-region'] && process.env.region) {
+    config.region = process.env.region;
+}
+if (config.region.length > 10 || !config.region.match(/^[a-z0-9_-]+$/i)) {
+    config.region = '';
+    console.log('Invalid value for region config variable.');
+}
+
+// Reload secret key
+if (config['reload-secret'] === '') {
+    // Add reload-secret to config.json to be able to run /reload?key=your-secret-key that will reload collections without restarting server
+    console.log('reload-secret configuration is empty. You will not be able to update all collections without restarting server.');
 }
 
 // Icons module
-const icons = serveDefaultIcons ? require('simple-svg-icons') : null;
+let icons = config['serve-default-icons'] ? require('simple-svg-icons') : null;
 
 // Collections list
 let collections = null,
@@ -91,7 +89,7 @@ function loadIcons() {
         }
 
         // Add collections from "json" directory
-        customIconDirectories.forEach(dir => {
+        config['custom-icon-dirs'].forEach(dir => {
             newCollections.addDirectory(dir);
         });
 
@@ -230,8 +228,8 @@ app.get(/^\/([a-z0-9:-]+)\.svg$/, (req, res) => {
 // Debug information and AWS health check
 app.get('/version', (req, res) => {
     let body = 'SimpleSVG CDN version ' + version + ' (Node';
-    if (region.length) {
-        body += ', ' + region;
+    if (config.region.length) {
+        body += ', ' + config.region;
     }
     body += ')';
     res.send(body);
@@ -239,7 +237,7 @@ app.get('/version', (req, res) => {
 
 // Reload collections without restarting app
 app.get('/reload', (req, res) => {
-    if (reloadKey.length && req.query && req.query.key && req.query.key === reloadKey) {
+    if (config['reload-secret'].length && req.query && req.query.key && req.query.key === config['reload-secret']) {
         // Reload collections
         process.nextTick(() => {
             if (loading) {
@@ -256,6 +254,8 @@ app.get('/reload', (req, res) => {
         });
     }
 
+    // Send 200 response regardless of reload status, so visitor would not know if secret key was correct
+    // Testing should be done by checking new icons that should have been added by reload
     res.sendStatus(200);
 });
 
@@ -265,8 +265,8 @@ app.get('/', (req, res) => {
 });
 
 // Create server
-app.listen(port, () => {
-    console.log('Listening on port ' + port);
+app.listen(config.port, () => {
+    console.log('Listening on port ' + config.port);
 });
 
 module.exports = app;
diff --git a/config-default.json b/config-default.json
new file mode 100644
index 0000000..dd09cd5
--- /dev/null
+++ b/config-default.json
@@ -0,0 +1,11 @@
+{
+  "port": 3000,
+  "env-port": true,
+  "region": "",
+  "env-region": true,
+  "reload-secret": "",
+  "custom-icon-dirs": [
+    "json"
+  ],
+  "serve-default-icons": true
+}
\ No newline at end of file
diff --git a/config.md b/config.md
new file mode 100644
index 0000000..d7d7861
--- /dev/null
+++ b/config.md
@@ -0,0 +1,60 @@
+# Configuration options
+
+Default options are in config-default.json
+
+Do not edit config-default.json unless you are making your own fork of project. All custom config options should be added to config.json. Create empty config.json:
+
+```
+{
+}
+```
+
+then add custom configuration variables to it.
+
+
+## Server configiration
+
+#### port
+
+Port to listen on. Default value is 3000
+
+#### env-port
+
+If true, script will check for environment variable "PORT" and if it is set, it will overwrite configuration option "port"
+
+#### region
+
+Region string to identify server. Set it if you run multiple servers to easily identify which server you are conneting to.
+
+To check which server you are connected to, open /version in browser.
+
+#### env-region
+
+If true, script will check for environment variable "REGION" and if it is set, it will overwrite configuration option "region"
+
+#### custom-icon-dirs
+
+List of directories with custom json files. By default list contains only directory "json". Directories should be relative to current working directory.
+
+#### serve-default-icons
+
+True if default SimpleSVG icons set should be served.
+
+
+## Reloading icon sets
+
+SimpleSVG icons server has ability to reload collections without restarting server. That allows to run server uninterrupted during icon sets updates.
+
+
+#### reload-secret
+
+To be able reload entire collection you need to set configuration variable reload-secret before starting server. Set value to any string.
+
+To reload collections follow these steps:
+
+* Upload new json files on server
+* Open /reload?key=your-reload-secret in browser
+
+This will reload all collections.
+
+Server will respond identically with "ok" message regardless of reload status to prevent visitors from trying to guess your secret key, so few seconds after reload you can verify that icons were reloaded by trying to open one of icons that were supposed to be added or removed.