diff --git a/composer.json b/composer.json
index 28affa1..285aeaf 100644
--- a/composer.json
+++ b/composer.json
@@ -24,7 +24,8 @@
    },
    "require-dev": {
       "phpunit/phpunit": "5.7.*",
-      "codeclimate/php-test-reporter": "dev-master"
+      "codeclimate/php-test-reporter": "dev-master",
+      "squizlabs/php_codesniffer": "3.4.2"
    },
    "autoload": {
       "classmap": ["AltoRouter.php"]
diff --git a/phpcs.xml b/phpcs.xml
new file mode 100644
index 0000000..d59cccf
--- /dev/null
+++ b/phpcs.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0"?>
+<ruleset name="rules">
+    <description>rules</description>
+    <rule ref="PSR2"/>
+    <rule ref="Generic.Arrays.DisallowLongArraySyntax"/>
+    <file>tests</file>
+    <file>AltoRouter.php</file>
+    <file>examples/</file>
+    <arg name="colors"/>
+</ruleset>