diff --git a/CHANGELOG.md b/CHANGELOG.md
index eb1af966..3f090c3a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,8 +5,10 @@
 * Case whatever we get from `get_option(uninstall_plugins)` to an array, to avoid throwing a warning. See [#36].
 * Fix variable syntax for `.env` file template. See [#38].
 * Fix RuntimeException because of `DB_NAME`, `DB_USER`, `DB_PASSWORD` not set. See [#48].
-* Code styles fixes.
 * Improve `Helpers::addHook()` by using WordPress function when available and loading `plugin.php` earlier on WP 4.7+. See [#50].
+* Add WP CLI step that adds a `wp-cli.yml` file in the project root. See [#33].
+* Code styles fixes.
+* Declare strict types in all files.
 
 ## [2.3.2] - 2016-07-28
 
diff --git a/wpstarter/src/Env/Env.php b/wpstarter/src/Env/Env.php
index 59a34802..d366310d 100644
--- a/wpstarter/src/Env/Env.php
+++ b/wpstarter/src/Env/Env.php
@@ -1,9 +1,7 @@
-<?php
+<?php declare( strict_types = 1 ); # -*- coding: utf-8 -*-
 /*
  * This file is part of the WP Starter package.
  *
- * (c) Giuseppe Mazzapica <giuseppe.mazzapica@gmail.com>
- *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
  */
diff --git a/wpstarter/src/Env/Loader.php b/wpstarter/src/Env/Loader.php
index 6a85cdf2..38ee184a 100644
--- a/wpstarter/src/Env/Loader.php
+++ b/wpstarter/src/Env/Loader.php
@@ -1,8 +1,6 @@
-<?php
+<?php declare( strict_types = 1 ); # -*- coding: utf-8 -*-
 /*
- * This file is part of the wpstarter package.
- *
- * (c) Giuseppe Mazzapica <giuseppe.mazzapica@gmail.com>
+ * This file is part of the WP Starter package.
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
@@ -28,9 +26,9 @@ final class Loader extends DotenvLoader
      */
     public function setEnvironmentVariable($name, $value = null)
     {
-        list($name, $value) = $this->normaliseEnvironmentVariable($name, $value);
+        list($normalised_name, $value) = $this->normaliseEnvironmentVariable($name, $value);
 
-        in_array($name, $this->allVars, true) or $this->allVars[] = $name;
+        in_array($normalised_name, $this->allVars, true) or $this->allVars[] = $normalised_name;
 
         if (!$this->immutable || is_null($this->getEnvironmentVariable($name))) {
             parent::setEnvironmentVariable($name, $value);
diff --git a/wpstarter/src/Helpers.php b/wpstarter/src/Helpers.php
index 676f5fa9..cd3128cd 100644
--- a/wpstarter/src/Helpers.php
+++ b/wpstarter/src/Helpers.php
@@ -1,9 +1,7 @@
-<?php
+<?php declare( strict_types = 1 ); # -*- coding: utf-8 -*-
 /*
  * This file is part of the WP Starter package.
  *
- * (c) Giuseppe Mazzapica <giuseppe.mazzapica@gmail.com>
- *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
  */
@@ -77,7 +75,11 @@ public static function addHook($hook, $callable, $priority = 10, $argsNum = 1)
             return;
         }
 
-        if (defined(ABSPATH) && is_file(ABSPATH.'wp-includes/plugin.php')) {
+        if (
+            defined(ABSPATH)
+            && is_file(ABSPATH.'wp-includes/class-wp-hook.php')
+            && is_file(ABSPATH.'wp-includes/plugin.php')
+        ) {
             require_once ABSPATH.'wp-includes/plugin.php';
             if (class_exists('WP_Hook')) {
                 add_filter($hook, $callable, $priority, $argsNum);
diff --git a/wpstarter/src/MuLoader/MuLoader.php b/wpstarter/src/MuLoader/MuLoader.php
index 4d4baf05..74a8a09e 100644
--- a/wpstarter/src/MuLoader/MuLoader.php
+++ b/wpstarter/src/MuLoader/MuLoader.php
@@ -1,9 +1,7 @@
-<?php
+<?php declare( strict_types = 1 ); # -*- coding: utf-8 -*-
 /*
  * This file is part of the WP Starter package.
  *
- * (c) Giuseppe Mazzapica <giuseppe.mazzapica@gmail.com>
- *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
  */
@@ -108,7 +106,10 @@ private function loading($refresh, $transient)
      */
     private function loadPlugin($key, $file, $refresh, $transient)
     {
-        if (is_readable($file) && strtolower(pathinfo($file, PATHINFO_EXTENSION)) === 'php') {
+        if (
+            is_readable($file)
+            && strtolower( (string) pathinfo($file, PATHINFO_EXTENSION)) === 'php'
+        ) {
             wp_register_plugin_realpath($file);
             if (in_array($file, $this->regular, true)) {
                 $this->regularLoaded[] = $file;
diff --git a/wpstarter/src/MuLoader/PluginAsMuLoader.php b/wpstarter/src/MuLoader/PluginAsMuLoader.php
index 899c5d4f..cf1157da 100644
--- a/wpstarter/src/MuLoader/PluginAsMuLoader.php
+++ b/wpstarter/src/MuLoader/PluginAsMuLoader.php
@@ -1,8 +1,6 @@
-<?php
+<?php declare( strict_types = 1 ); # -*- coding: utf-8 -*-
 /*
- * This file is part of the WPStarter package.
- *
- * (c) Giuseppe Mazzapica <giuseppe.mazzapica@gmail.com>
+ * This file is part of the WP Starter package.
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
diff --git a/wpstarter/src/Setup.php b/wpstarter/src/Setup.php
index e5990cd0..76fa97f0 100644
--- a/wpstarter/src/Setup.php
+++ b/wpstarter/src/Setup.php
@@ -1,8 +1,6 @@
-<?php
+<?php declare( strict_types = 1 ); # -*- coding: utf-8 -*-
 /*
- * This file is part of the WPStarter package.
- *
- * (c) Giuseppe Mazzapica <giuseppe.mazzapica@gmail.com>
+ * This file is part of the WP Starter package.
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
@@ -25,6 +23,7 @@
 use WCM\WPStarter\Setup\Steps\GitignoreStep;
 use WCM\WPStarter\Setup\Steps\IndexStep;
 use WCM\WPStarter\Setup\Steps\MoveContentStep;
+use WCM\WPStarter\Setup\Steps\WPCliStep;
 use WCM\WPStarter\Setup\Steps\WPConfigStep;
 
 /**
@@ -102,6 +101,7 @@ private function install(Composer $composer, Config $config, IO $io, array $extr
                 ->addStep(new EnvExampleStep($io, $builder))
                 ->addStep(new DropinsStep($io, $overwrite))
                 ->addStep(new GitignoreStep($io, $builder))
+                ->addStep(new WPCliStep($builder))
                 ->addStep(new MoveContentStep($io))
                 ->run($paths);
         }
diff --git a/wpstarter/src/Setup/Config.php b/wpstarter/src/Setup/Config.php
index bd39ea46..e36606c6 100644
--- a/wpstarter/src/Setup/Config.php
+++ b/wpstarter/src/Setup/Config.php
@@ -1,8 +1,6 @@
-<?php
+<?php declare( strict_types = 1 ); # -*- coding: utf-8 -*-
 /*
- * This file is part of the WPStarter package.
- *
- * (c) Giuseppe Mazzapica <giuseppe.mazzapica@gmail.com>
+ * This file is part of the WP Starter package.
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
@@ -185,7 +183,7 @@ private function validateBoolOrAskOrUrl($value)
     private function validateBoolOrAsk($value)
     {
         $asks = array('ask', 'prompt', 'query', 'interrogate', 'demand');
-        if (in_array(trim(strtolower($value)), $asks, true)) {
+        if (is_string($value) && in_array(trim(strtolower($value)), $asks, true)) {
             return 'ask';
         }
 
diff --git a/wpstarter/src/Setup/FileBuilder.php b/wpstarter/src/Setup/FileBuilder.php
index 2b912caa..e7d5ccc1 100644
--- a/wpstarter/src/Setup/FileBuilder.php
+++ b/wpstarter/src/Setup/FileBuilder.php
@@ -1,8 +1,6 @@
-<?php
+<?php declare( strict_types = 1 ); # -*- coding: utf-8 -*-
 /*
- * This file is part of the WPStarter package.
- *
- * (c) Giuseppe Mazzapica <giuseppe.mazzapica@gmail.com>
+ * This file is part of the WP Starter package.
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
diff --git a/wpstarter/src/Setup/IO.php b/wpstarter/src/Setup/IO.php
index 53e62443..14b0567c 100644
--- a/wpstarter/src/Setup/IO.php
+++ b/wpstarter/src/Setup/IO.php
@@ -1,8 +1,6 @@
-<?php
+<?php declare( strict_types = 1 ); # -*- coding: utf-8 -*-
 /*
- * This file is part of the WPStarter package.
- *
- * (c) Giuseppe Mazzapica <giuseppe.mazzapica@gmail.com>
+ * This file is part of the WP Starter package.
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
diff --git a/wpstarter/src/Setup/OverwriteHelper.php b/wpstarter/src/Setup/OverwriteHelper.php
index 78d21269..657c0641 100644
--- a/wpstarter/src/Setup/OverwriteHelper.php
+++ b/wpstarter/src/Setup/OverwriteHelper.php
@@ -1,8 +1,6 @@
-<?php
+<?php declare( strict_types = 1 ); # -*- coding: utf-8 -*-
 /*
- * This file is part of the WPStarter package.
- *
- * (c) Giuseppe Mazzapica <giuseppe.mazzapica@gmail.com>
+ * This file is part of the WP Starter package.
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
diff --git a/wpstarter/src/Setup/Salter.php b/wpstarter/src/Setup/Salter.php
index 0764490b..f6edef6d 100644
--- a/wpstarter/src/Setup/Salter.php
+++ b/wpstarter/src/Setup/Salter.php
@@ -1,8 +1,6 @@
-<?php
+<?php declare( strict_types = 1 ); # -*- coding: utf-8 -*-
 /*
- * This file is part of the WPStarter package.
- *
- * (c) Giuseppe Mazzapica <giuseppe.mazzapica@gmail.com>
+ * This file is part of the WP Starter package.
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
diff --git a/wpstarter/src/Setup/Stepper.php b/wpstarter/src/Setup/Stepper.php
index 2324f27e..3d5ac245 100644
--- a/wpstarter/src/Setup/Stepper.php
+++ b/wpstarter/src/Setup/Stepper.php
@@ -1,8 +1,6 @@
-<?php
+<?php declare( strict_types = 1 ); # -*- coding: utf-8 -*-
 /*
- * This file is part of the WPStarter package.
- *
- * (c) Giuseppe Mazzapica <giuseppe.mazzapica@gmail.com>
+ * This file is part of the WP Starter package.
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
diff --git a/wpstarter/src/Setup/StepperInterface.php b/wpstarter/src/Setup/StepperInterface.php
index fd0633b8..55593951 100644
--- a/wpstarter/src/Setup/StepperInterface.php
+++ b/wpstarter/src/Setup/StepperInterface.php
@@ -1,8 +1,6 @@
-<?php
+<?php # -*- coding: utf-8 -*-
 /*
- * This file is part of the WPStarter package.
- *
- * (c) Giuseppe Mazzapica <giuseppe.mazzapica@gmail.com>
+ * This file is part of the WP Starter package.
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
diff --git a/wpstarter/src/Setup/Steps/BlockingStepInterface.php b/wpstarter/src/Setup/Steps/BlockingStepInterface.php
index 3a21c779..1de0125c 100644
--- a/wpstarter/src/Setup/Steps/BlockingStepInterface.php
+++ b/wpstarter/src/Setup/Steps/BlockingStepInterface.php
@@ -1,8 +1,6 @@
-<?php
+<?php # -*- coding: utf-8 -*-
 /*
- * This file is part of the WPStarter package.
- *
- * (c) Giuseppe Mazzapica <giuseppe.mazzapica@gmail.com>
+ * This file is part of the WP Starter package.
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
diff --git a/wpstarter/src/Setup/Steps/CheckPathStep.php b/wpstarter/src/Setup/Steps/CheckPathStep.php
index 550fc6c9..1b908cb8 100644
--- a/wpstarter/src/Setup/Steps/CheckPathStep.php
+++ b/wpstarter/src/Setup/Steps/CheckPathStep.php
@@ -1,8 +1,6 @@
-<?php
+<?php declare( strict_types = 1 ); # -*- coding: utf-8 -*-
 /*
- * This file is part of the WPStarter package.
- *
- * (c) Giuseppe Mazzapica <giuseppe.mazzapica@gmail.com>
+ * This file is part of the WP Starter package.
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
diff --git a/wpstarter/src/Setup/Steps/DropinStep.php b/wpstarter/src/Setup/Steps/DropinStep.php
index 3a27c6cf..f23f4c95 100644
--- a/wpstarter/src/Setup/Steps/DropinStep.php
+++ b/wpstarter/src/Setup/Steps/DropinStep.php
@@ -1,8 +1,6 @@
-<?php
+<?php declare( strict_types = 1 ); # -*- coding: utf-8 -*-
 /*
- * This file is part of the WPStarter package.
- *
- * (c) Giuseppe Mazzapica <giuseppe.mazzapica@gmail.com>
+ * This file is part of the WP Starter package.
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
diff --git a/wpstarter/src/Setup/Steps/DropinsStep.php b/wpstarter/src/Setup/Steps/DropinsStep.php
index 5600206a..92395ae8 100644
--- a/wpstarter/src/Setup/Steps/DropinsStep.php
+++ b/wpstarter/src/Setup/Steps/DropinsStep.php
@@ -1,8 +1,6 @@
-<?php
+<?php declare( strict_types = 1 ); # -*- coding: utf-8 -*-
 /*
- * This file is part of the WPStarter package.
- *
- * (c) Giuseppe Mazzapica <giuseppe.mazzapica@gmail.com>
+ * This file is part of the WP Starter package.
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
@@ -147,7 +145,7 @@ private function validName($name)
         if ($this->config['unknown-dropins'] === true || in_array($name, self::$dropins, true)) {
             return true;
         }
-        $ext = pathinfo($name, PATHINFO_EXTENSION);
+        $ext = (string) pathinfo($name, PATHINFO_EXTENSION);
         if (strtolower($ext) !== 'php') {
             return $this->config['unknown-dropins'] === 'ask' && $this->ask($name, 0);
         }
diff --git a/wpstarter/src/Setup/Steps/EnvExampleStep.php b/wpstarter/src/Setup/Steps/EnvExampleStep.php
index abd15884..a0ce05d1 100644
--- a/wpstarter/src/Setup/Steps/EnvExampleStep.php
+++ b/wpstarter/src/Setup/Steps/EnvExampleStep.php
@@ -1,13 +1,10 @@
-<?php
+<?php declare( strict_types = 1 ); # -*- coding: utf-8 -*-
 /*
- * This file is part of the WPStarter package.
- *
- * (c) Giuseppe Mazzapica <giuseppe.mazzapica@gmail.com>
+ * This file is part of the WP Starter package.
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
  */
-
 namespace WCM\WPStarter\Setup\Steps;
 
 use WCM\WPStarter\Setup\IO;
diff --git a/wpstarter/src/Setup/Steps/FileStepInterface.php b/wpstarter/src/Setup/Steps/FileStepInterface.php
index f4d613a1..ec76db2b 100644
--- a/wpstarter/src/Setup/Steps/FileStepInterface.php
+++ b/wpstarter/src/Setup/Steps/FileStepInterface.php
@@ -1,8 +1,6 @@
-<?php
+<?php # -*- coding: utf-8 -*-
 /*
- * This file is part of the WPStarter package.
- *
- * (c) Giuseppe Mazzapica <giuseppe.mazzapica@gmail.com>
+ * This file is part of the WP Starter package.
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
diff --git a/wpstarter/src/Setup/Steps/GitignoreStep.php b/wpstarter/src/Setup/Steps/GitignoreStep.php
index 8e76ec20..10028ffa 100644
--- a/wpstarter/src/Setup/Steps/GitignoreStep.php
+++ b/wpstarter/src/Setup/Steps/GitignoreStep.php
@@ -1,13 +1,10 @@
-<?php
+<?php declare( strict_types = 1 ); # -*- coding: utf-8 -*-
 /*
- * This file is part of the WPStarter package.
- *
- * (c) Giuseppe Mazzapica <giuseppe.mazzapica@gmail.com>
+ * This file is part of the WP Starter package.
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
  */
-
 namespace WCM\WPStarter\Setup\Steps;
 
 use WCM\WPStarter\Setup\Config;
diff --git a/wpstarter/src/Setup/Steps/IndexStep.php b/wpstarter/src/Setup/Steps/IndexStep.php
index 8854a626..aa357d8a 100644
--- a/wpstarter/src/Setup/Steps/IndexStep.php
+++ b/wpstarter/src/Setup/Steps/IndexStep.php
@@ -1,8 +1,6 @@
-<?php
+<?php declare( strict_types = 1 ); # -*- coding: utf-8 -*-
 /*
- * This file is part of the WPStarter package.
- *
- * (c) Giuseppe Mazzapica <giuseppe.mazzapica@gmail.com>
+ * This file is part of the WP Starter package.
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
diff --git a/wpstarter/src/Setup/Steps/MoveContentStep.php b/wpstarter/src/Setup/Steps/MoveContentStep.php
index f34880bf..dbd2acfb 100644
--- a/wpstarter/src/Setup/Steps/MoveContentStep.php
+++ b/wpstarter/src/Setup/Steps/MoveContentStep.php
@@ -1,8 +1,6 @@
-<?php
+<?php declare( strict_types = 1 ); # -*- coding: utf-8 -*-
 /*
- * This file is part of the WPStarter package.
- *
- * (c) Giuseppe Mazzapica <giuseppe.mazzapica@gmail.com>
+ * This file is part of the WP Starter package.
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
diff --git a/wpstarter/src/Setup/Steps/OptionalStepInterface.php b/wpstarter/src/Setup/Steps/OptionalStepInterface.php
index fd583c79..6237ae35 100644
--- a/wpstarter/src/Setup/Steps/OptionalStepInterface.php
+++ b/wpstarter/src/Setup/Steps/OptionalStepInterface.php
@@ -1,8 +1,6 @@
-<?php
+<?php # -*- coding: utf-8 -*-
 /*
- * This file is part of the WPStarter package.
- *
- * (c) Giuseppe Mazzapica <giuseppe.mazzapica@gmail.com>
+ * This file is part of the WP Starter package.
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
diff --git a/wpstarter/src/Setup/Steps/PostProcessStepInterface.php b/wpstarter/src/Setup/Steps/PostProcessStepInterface.php
index dd898bbe..77d03ea8 100644
--- a/wpstarter/src/Setup/Steps/PostProcessStepInterface.php
+++ b/wpstarter/src/Setup/Steps/PostProcessStepInterface.php
@@ -1,8 +1,6 @@
-<?php
+<?php # -*- coding: utf-8 -*-
 /*
- * This file is part of the WPStarter package.
- *
- * (c) Giuseppe Mazzapica <giuseppe.mazzapica@gmail.com>
+ * This file is part of the WP Starter package.
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
diff --git a/wpstarter/src/Setup/Steps/StepInterface.php b/wpstarter/src/Setup/Steps/StepInterface.php
index c4b5d670..6549a135 100644
--- a/wpstarter/src/Setup/Steps/StepInterface.php
+++ b/wpstarter/src/Setup/Steps/StepInterface.php
@@ -1,8 +1,6 @@
-<?php
+<?php # -*- coding: utf-8 -*-
 /*
- * This file is part of the WPStarter package.
- *
- * (c) Giuseppe Mazzapica <giuseppe.mazzapica@gmail.com>
+ * This file is part of the WP Starter package.
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
diff --git a/wpstarter/src/Setup/Steps/WPCliStep.php b/wpstarter/src/Setup/Steps/WPCliStep.php
new file mode 100644
index 00000000..605bf509
--- /dev/null
+++ b/wpstarter/src/Setup/Steps/WPCliStep.php
@@ -0,0 +1,118 @@
+<?php declare( strict_types = 1 ); # -*- coding: utf-8 -*-
+/*
+ * This file is part of the WP Starter package.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace WCM\WPStarter\Setup\Steps;
+
+use ArrayAccess;
+use WCM\WPStarter\Setup\Config;
+use WCM\WPStarter\Setup\FileBuilder;
+
+/**
+ * Steps that generates wp-cli.yml in root folder.
+ *
+ * @author  Franz Josef Kaiser <wecodemore@gmail.com>
+ * @license http://opensource.org/licenses/MIT MIT
+ * @package WPStarter
+ */
+class WPCliStep implements FileStepInterface, BlockingStepInterface
+{
+	/**
+	 * @var \WCM\WPStarter\Setup\FileBuilder
+	 */
+	private $builder;
+
+	/**
+	 * @var array
+	 */
+	private $vars;
+
+	/**
+	 * @var string
+	 */
+	private $error = '';
+
+	/**
+	 * @param \WCM\WPStarter\Setup\FileBuilder $builder
+	 */
+	public function __construct( FileBuilder $builder )
+	{
+		$this->builder = $builder;
+	}
+
+	/**
+	 * Returns the target path of the file the step will create.
+	 *
+	 * @param  \ArrayAccess $paths
+	 * @return string
+	 */
+	public function targetPath( ArrayAccess $paths )
+	{
+		return rtrim( $paths['root'], "/" )."/wp-cli.yml";
+	}
+
+	/**
+	 * Return true if the step is allowed, i.e. the run method have to be called or not
+	 *
+	 * @param  \WCM\WPStarter\Setup\Config $config
+	 * @param  \ArrayAccess                $paths
+	 * @return bool
+	 */
+	public function allowed( Config $config, ArrayAccess $paths )
+	{
+		return true;
+	}
+
+	/**
+	 * Process the step.
+	 *
+	 * @param  \ArrayAccess $paths Have to return one of the step constants.
+	 * @return int
+	 */
+	public function run( ArrayAccess $paths )
+	{
+		$wp_install_path = rtrim( "{$paths['root']}/{$paths['wp']}", '/' );
+
+		$this->vars  = array( 'WP_INSTALL_PATH' => $wp_install_path, );
+		$build       = $this->builder->build(
+			$paths,
+			'wp-cli.yml.example',
+			$this->vars
+		);
+
+		if ( ! $this->builder->save(
+			$build,
+			dirname( $this->targetPath( $paths ) ),
+			'wp-cli.yml'
+		) ) {
+			$this->error = 'Error while creating wp-cli.yml';
+
+			return self::ERROR;
+		}
+
+		return self::SUCCESS;
+	}
+
+	/**
+	 * Return error message if any.
+	 *
+	 * @return string
+	 */
+	public function error()
+	{
+		return $this->error;
+	}
+
+	/**
+	 * Return success message if any.
+	 *
+	 * @return string
+	 */
+	public function success()
+	{
+		return '<comment>wp-cli.yml</comment> saved successfully.';
+	}
+}
\ No newline at end of file
diff --git a/wpstarter/src/Setup/Steps/WPConfigStep.php b/wpstarter/src/Setup/Steps/WPConfigStep.php
index 8d4df091..f24abbec 100644
--- a/wpstarter/src/Setup/Steps/WPConfigStep.php
+++ b/wpstarter/src/Setup/Steps/WPConfigStep.php
@@ -1,8 +1,6 @@
-<?php
+<?php declare( strict_types = 1 ); # -*- coding: utf-8 -*-
 /*
- * This file is part of the WPStarter package.
- *
- * (c) Giuseppe Mazzapica <giuseppe.mazzapica@gmail.com>
+ * This file is part of the WP Starter package.
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
diff --git a/wpstarter/src/Setup/UrlDownloader.php b/wpstarter/src/Setup/UrlDownloader.php
index 9d66b2da..36760283 100644
--- a/wpstarter/src/Setup/UrlDownloader.php
+++ b/wpstarter/src/Setup/UrlDownloader.php
@@ -1,8 +1,6 @@
-<?php
+<?php declare( strict_types = 1 ); # -*- coding: utf-8 -*-
 /*
- * This file is part of the WPStarter package.
- *
- * (c) Giuseppe Mazzapica <giuseppe.mazzapica@gmail.com>
+ * This file is part of the WP Starter package.
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
diff --git a/wpstarter/templates/wp-cli.yml.example b/wpstarter/templates/wp-cli.yml.example
new file mode 100644
index 00000000..df878c32
--- /dev/null
+++ b/wpstarter/templates/wp-cli.yml.example
@@ -0,0 +1 @@
+path: {{{WP_INSTALL_PATH}}}
\ No newline at end of file