diff --git a/src/Tokenizer/Parser/Reserved.php b/src/Tokenizer/Parser/Reserved.php
index 0f2f13f..ba9b55e 100644
--- a/src/Tokenizer/Parser/Reserved.php
+++ b/src/Tokenizer/Parser/Reserved.php
@@ -64,7 +64,7 @@ protected static function isReservedPrecededByDotCharacter($previous)
     /**
      * @param array     $tokenData
      * @param           $type
-     * @param           $string
+     * @param           string $string
      * @param Tokenizer $tokenizer
      */
     protected static function getReservedString(array &$tokenData, $type, $string, Tokenizer $tokenizer)
diff --git a/src/Tokenizer/Tokenizer.php b/src/Tokenizer/Tokenizer.php
index 981a336..c27ed6f 100644
--- a/src/Tokenizer/Tokenizer.php
+++ b/src/Tokenizer/Tokenizer.php
@@ -169,7 +169,7 @@ protected function processTokens($string)
     }
 
     /**
-     * @param $string
+     * @param string $string
      *
      * @return string
      */
@@ -234,7 +234,7 @@ protected function getNextTokenFromCache($cacheKey)
      * Get the next token and the token type and store it in cache.
      *
      * @param string $string
-     * @param        $token
+     * @param        string $token
      * @param string $cacheKey
      *
      * @return array