diff --git a/README.md b/README.md
index b26afcf..0ccf340 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,12 @@
 
 Cast your Eloquent model attributes to value objects with ease!
 
+### Requirements
+
+This package requires PHP >= 5.4. Using the latest version of PHP is highly recommended. Laravel 4.x and 5.x are supported.
+
+> **Note:** Running tests for this package requires PHP >=5.6.
+
 ### Install
 
 Require this package with composer using the following command:
diff --git a/composer.json b/composer.json
index 743604b..0657090 100644
--- a/composer.json
+++ b/composer.json
@@ -1,6 +1,6 @@
 {
     "name": "redcrystal/cast",
-    "description": "Cast your model attributes to value objects!",
+    "description": "Laravel Value Objects: Cast your Eloquent model attributes to value objects with ease!",
     "license": "MIT",
     "authors": [
         {
diff --git a/src/CastsValueObjects.php b/src/CastsValueObjects.php
index 31c7339..56a2252 100644
--- a/src/CastsValueObjects.php
+++ b/src/CastsValueObjects.php
@@ -12,7 +12,7 @@ trait CastsValueObjects
     protected $cachedObjects = [];
 
     /**
-     * @param $key
+     * @param string $key
      *
      * @return mixed
      */
@@ -44,8 +44,8 @@ public function getAttribute($key)
     }
 
     /**
-     * @param $key
-     * @param $value
+     * @param string $key
+     * @param mixed $value
      */
     public function setAttribute($key, $value)
     {
@@ -78,7 +78,7 @@ public function setAttribute($key, $value)
     }
 
     /**
-     * @param $key
+     * @param string $key
      *
      * @return mixed
      */
@@ -90,7 +90,7 @@ private function createValueObject($key, $value)
     }
 
     /**
-     * @param $key
+     * @param string $key
      * @param ValueObject $object
      */
     private function cacheValueObject($key, ValueObject $object)
@@ -99,7 +99,7 @@ private function cacheValueObject($key, ValueObject $object)
     }
 
     /**
-     * @param $key
+     * @param string $key
      */
     private function invalidateValueObjectCache($key)
     {
@@ -107,7 +107,7 @@ private function invalidateValueObjectCache($key)
     }
 
     /**
-     * @param $key
+     * @param string $key
      *
      * @return bool
      */
@@ -117,7 +117,7 @@ private function isValueObjectCached($key)
     }
 
     /**
-     * @param $key
+     * @param string $key
      *
      * @return ValueObject
      */