diff --git a/src/Filters/LambdaFilter.php b/src/Filters/LambdaFilter.php
index b30aece..7f1e531 100755
--- a/src/Filters/LambdaFilter.php
+++ b/src/Filters/LambdaFilter.php
@@ -12,13 +12,13 @@ class LambdaFilter implements ITokenTransformation
 {
     /**
      *
-     * @var function
+     * @var callable
      */
     protected $lambdaFunc = null;
 
     /**
      * 
-     * @param function $lambdaFunc
+     * @param callable $lambdaFunc
      */
     public function __construct($lambdaFunc) 
     {
diff --git a/src/Tokenizers/LambdaTokenizer.php b/src/Tokenizers/LambdaTokenizer.php
index 3b83856..daa71da 100644
--- a/src/Tokenizers/LambdaTokenizer.php
+++ b/src/Tokenizers/LambdaTokenizer.php
@@ -14,13 +14,13 @@ class LambdaTokenizer extends TokenizerAbstract
     
     /**
      *
-     * @var function
+     * @var callable
      */
     protected $lambdaFunc = null;
 
     /**
      * 
-     * @param function $lambdaFunc
+     * @param callable $lambdaFunc
      */
     public function __construct($lambdaFunc) 
     {