diff --git a/README.md b/README.md
index 3409a3f..00e0e2d 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ It takes a JSON file and returns a copy of the same file, but with the sorted ke
 
 ## Installation
 
-` [sudo] npm -g install sort-json`
+`[sudo] npm -g install sort-json`
 
 ## Usage
 
@@ -24,13 +24,13 @@ sortJson.overwrite(['some/absolute/path1.json', 'some/absolute/path2.json'], opt
 
 ## CLI usage
 
-`sort-json filename [options]`
+`sort-json [options] [filenames]`
 Sorts and overwrites .json or .rc files.
 
 _Example_
-`sort-json test.json --ignore-case`
+`sort-json --ignore-case test.json`
 
- **Options**
+### Options
 
 `--ignore-case, -i`\
 Ignore case when sorting.
@@ -49,6 +49,12 @@ Use a number greater then 0 for the _SIZE_ value.
 `--no-final-newline, -nn`\
 No final new line will be added to the end of the file.
 
+### Files
+
+List of json files that should be sorted.
+The paths can be absolute or relative to the current directory.
+
+Filenames must end with `.json` or `.rc`. All other files are ignored.
 
 ## Upgrade to version 2.x
 
diff --git a/app/cmd.js b/app/cmd.js
index d4c9d59..a815491 100755
--- a/app/cmd.js
+++ b/app/cmd.js
@@ -6,6 +6,7 @@ const path = require('path');
 // NPM dependencies
 const minimist = require('minimist');
 const sortJson = require('./');
+const globFiles = require('./globFiles');
 
 const alias = {
   depth: ['d'],
@@ -15,9 +16,11 @@ const alias = {
   noFinalNewLine: ['no-final-newline', 'nn'],
 };
 
-const argv = minimist(process.argv.slice(2), { alias });
+(async () => {
+  const argv = minimist(process.argv.slice(2), { alias });
 
-// Get all the files
-const files = argv._.filter(arg => arg.endsWith('.json') || arg.endsWith('.rc'));
+  // Get all the files
+  const files = await globFiles(argv._);
 
-sortJson.overwrite(files.map(file => path.resolve(file)), argv);
+  sortJson.overwrite(files.map(file => path.resolve(file)), argv);
+})();
diff --git a/app/globFiles.js b/app/globFiles.js
new file mode 100644
index 0000000..3d3c901
--- /dev/null
+++ b/app/globFiles.js
@@ -0,0 +1,11 @@
+/**
+ * Takes in a list of file-paths and returns a list of filtered file-paths.
+ * @param {String|Array} args   - String: path to json file to sort and overwrite
+ *                              - Array: paths to json files to sort and overwrite
+ * @returns {String[]}          - List of all json files that are included in the args
+ */
+async function globFiles(args) {
+  return args.filter(arg => arg.endsWith('.json') || arg.endsWith('.rc'));
+}
+
+module.exports = globFiles;
diff --git a/index.js b/index.js
index 94ab165..a9612f4 100644
--- a/index.js
+++ b/index.js
@@ -1,3 +1 @@
-'use strict';
-
-module.exports = require('./app');
\ No newline at end of file
+module.exports = require('./app');