diff --git a/src/Duration/Duration.php b/src/Duration/Duration.php
index 1fae1bff6197e865e7fbbac93723496cdbef0647..4619f1ca6fd844b71316d4cb980b9a6b2258243b 100644
--- a/src/Duration/Duration.php
+++ b/src/Duration/Duration.php
@@ -37,7 +37,7 @@ class Duration implements Arrayable, JsonSerializable
     /**
      * Duration constructor.
      *
-     * @param $seconds
+     * @param  $seconds
      */
     public function __construct($seconds = 0)
     {
@@ -77,7 +77,7 @@ class Duration implements Arrayable, JsonSerializable
     }
 
     /**
-     * @param $format
+     * @param  $format
      * @return $this
      */
     public function setFormat($format)
diff --git a/src/Duration/DurationFormatter.php b/src/Duration/DurationFormatter.php
index b707fd455afb3cea7a50d52544048b4370eff446..61d3cec6a1c9ad8b6cc3d1478e57b42842246271 100644
--- a/src/Duration/DurationFormatter.php
+++ b/src/Duration/DurationFormatter.php
@@ -32,7 +32,7 @@ class DurationFormatter
     }
 
     /**
-     * @param $format
+     * @param  $format
      * @return mixed
      */
     public function get($format)
@@ -66,7 +66,7 @@ class DurationFormatter
 
     /**
      * @param  Collection  $units
-     * @param $format
+     * @param  $format
      * @return mixed
      */
     protected function applyFormat(Collection $units, $format)
diff --git a/src/Duration/DurationOperations.php b/src/Duration/DurationOperations.php
index bc3bd68a94169c4dee7f23277937fccc2eee0986..30f2482be71724e5e326243098799b2dc4f75bf9 100644
--- a/src/Duration/DurationOperations.php
+++ b/src/Duration/DurationOperations.php
@@ -25,7 +25,7 @@ trait DurationOperations
     /**
      * Retrieve the sum of an array.
      *
-     * @param $items
+     * @param  $items
      * @param  null  $callback
      * @return Duration
      *
diff --git a/src/Period/Period.php b/src/Period/Period.php
index 740259e0d5c144842a10a4d652af7f992effbdfc..1ea3598d1b7a07d8c4113efe8644fb5935497dcf 100644
--- a/src/Period/Period.php
+++ b/src/Period/Period.php
@@ -24,8 +24,8 @@ class Period implements Arrayable, JsonSerializable
     /**
      * TimeSpan constructor.
      *
-     * @param $start
-     * @param $end
+     * @param  $start
+     * @param  $end
      */
     public function __construct($start = null, $end = null)
     {
@@ -114,7 +114,7 @@ class Period implements Arrayable, JsonSerializable
     // _________________________________________________________________________________________________________________
 
     /**
-     * @param $time
+     * @param  $time
      * @return Carbon|null
      */
     protected function normalizeInput($time)
@@ -130,7 +130,7 @@ class Period implements Arrayable, JsonSerializable
     }
 
     /**
-     * @param $time
+     * @param  $time
      * @return Carbon|null
      */
     protected function normalizeOutput($time)
diff --git a/src/Shared/RetrievesValues.php b/src/Shared/RetrievesValues.php
index 50d214c16f10554ef5d493d5e8e469d798cd5bbb..6c80b697355d308fc3dc7b7707b159d14cdcefc6 100644
--- a/src/Shared/RetrievesValues.php
+++ b/src/Shared/RetrievesValues.php
@@ -7,7 +7,7 @@ trait RetrievesValues
     /**
      * Returns a closure function to retrieve a value from an $item parameter.
      *
-     * @param $callback
+     * @param  $callback
      * @return \Closure
      */
     private static function valueRetriever($callback)
diff --git a/src/Shared/ValidatesArrays.php b/src/Shared/ValidatesArrays.php
index 96acfad26201f719441f26845fa969870fa24d16..8a2be4b63571c32195e1c8bed6fa1a63ca928d85 100644
--- a/src/Shared/ValidatesArrays.php
+++ b/src/Shared/ValidatesArrays.php
@@ -5,8 +5,8 @@ namespace Makeable\ValueObjects\Shared;
 trait ValidatesArrays
 {
     /**
-     * @param $keys
-     * @param $array
+     * @param  $keys
+     * @param  $array
      *
      * @throws MissingPropertiesException
      */
diff --git a/src/Whitelist/Whitelist.php b/src/Whitelist/Whitelist.php
index 7b30b123a7c7611280b52d32ab840d41dc3aa6a8..920f9edb0603c235fb7ff202be8b1f2a0db2041d 100644
--- a/src/Whitelist/Whitelist.php
+++ b/src/Whitelist/Whitelist.php
@@ -17,7 +17,7 @@ abstract class Whitelist
     protected $value;
 
     /**
-     * @param $value
+     * @param  $value
      */
     public function __construct($value)
     {
@@ -44,7 +44,7 @@ abstract class Whitelist
     }
 
     /**
-     * @param $value
+     * @param  $value
      * @return bool
      */
     public static function isValid($value)