diff --git a/src/Duration/Duration.php b/src/Duration/Duration.php
index 1fae1bf..4619f1c 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 @@ public function getSeconds()
     }
 
     /**
-     * @param $format
+     * @param  $format
      * @return $this
      */
     public function setFormat($format)
diff --git a/src/Duration/DurationFormatter.php b/src/Duration/DurationFormatter.php
index b707fd4..61d3cec 100644
--- a/src/Duration/DurationFormatter.php
+++ b/src/Duration/DurationFormatter.php
@@ -32,7 +32,7 @@ public function __construct(Duration $duration)
     }
 
     /**
-     * @param $format
+     * @param  $format
      * @return mixed
      */
     public function get($format)
@@ -66,7 +66,7 @@ public function get($format)
 
     /**
      * @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 bc3bd68..30f2482 100644
--- a/src/Duration/DurationOperations.php
+++ b/src/Duration/DurationOperations.php
@@ -25,7 +25,7 @@ public function subtract(Duration $duration)
     /**
      * 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 740259e..1ea3598 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 @@ public function latest(Carbon $time)
     // _________________________________________________________________________________________________________________
 
     /**
-     * @param $time
+     * @param  $time
      * @return Carbon|null
      */
     protected function normalizeInput($time)
@@ -130,7 +130,7 @@ protected function normalizeInput($time)
     }
 
     /**
-     * @param $time
+     * @param  $time
      * @return Carbon|null
      */
     protected function normalizeOutput($time)
diff --git a/src/Shared/RetrievesValues.php b/src/Shared/RetrievesValues.php
index 50d214c..6c80b69 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 96acfad..8a2be4b 100644
--- a/src/Shared/ValidatesArrays.php
+++ b/src/Shared/ValidatesArrays.php
@@ -5,8 +5,8 @@
 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 7b30b12..920f9ed 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 @@ public function get()
     }
 
     /**
-     * @param $value
+     * @param  $value
      * @return bool
      */
     public static function isValid($value)