diff --git a/README.md b/README.md
index aca61eb..5c3417a 100644
--- a/README.md
+++ b/README.md
@@ -45,6 +45,15 @@ The only configuration you need to provide is a mapping, which maps a folder on
 host = "https://example.org"
 ```
 
+same example saved as default.json
+```json
+{ "mappings": {
+    "example": {
+      "host": "https://example.org"
+    } 
+  } 
+}
+```
 This is the minimal required configuration. It will map `http://localhost:<port>/example/*` to `https://example.org/*`.
 
 
@@ -174,6 +183,20 @@ Date: Thu, 11 Feb 2016 17:24:10 GMT
 {"status":"ok"}
 ```
 
+
+## CLI
+
+| param            | description                                                                          |
+|------------------|--------------------------------------------------------------------------------------|
+| `root` or `(r)`  | This is the folder where mock files will be saved                                    |
+| `config` or `(c)`| This is the folder where config files are located                                    |
+| `name` or `(n)`  | This is config file name                                                             |
+
+And example:
+```
+npm run start --config "./config_dir" --name "amp_config_file_name" --root "./config_dir/mocks"
+```
+
 ## Advanced
 
 There are some more advanced configuration options available. For example, AMP uses [node-config][nc] to manage its config files, so there are options for providing different config files per environment.
diff --git a/src/argv.js b/src/argv.js
new file mode 100644
index 0000000..ea14eee
--- /dev/null
+++ b/src/argv.js
@@ -0,0 +1,17 @@
+/* globals process */
+import minimist from 'minimist';
+
+const argv = minimist(process.argv.slice(2), {alias: {
+  root: ['r', 'data'],
+  config: ['c'],
+  name: ['n']
+}});
+
+if (argv.config) {
+  process.env.NODE_CONFIG_DIR = argv.config;
+}
+if (argv.name) {
+  process.env.NODE_ENV = argv.name;
+}
+
+export default argv;
diff --git a/src/cli.js b/src/cli.js
index 40776d4..1479f9a 100644
--- a/src/cli.js
+++ b/src/cli.js
@@ -1,11 +1,9 @@
 /* globals process */
-import minimist from 'minimist';
+import argv from './argv';
 import cacher from './cacher';
 import server from './serve';
 import config from 'config';
 
-const argv = minimist(process.argv.slice(2), {alias: {root: ['r', 'data']}});
-
 if (argv.root) {
   cacher.root = argv.root;
 }