diff --git a/README.md b/README.md
index ceeecf2..22bf354 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,7 @@ With this Service Provider, you can draw amazing char by usign [Morris.js]( http
 ## Requirements
 
 * PHP 5.5.9 or greater
-* Laravel 5.2 or greater
+* Laravel 5.4 or greater
 
 ## Installation
 
@@ -64,6 +64,7 @@ echo Morris::area( 'morris-area' )
            ->xkey( [ 'y' ] )
            ->ykeys( [ 'a', 'b' ] )
            ->labels( [ 'Series A', 'Series B' ] )
+           ->hoverCallback( 'function(index, options, content){var row = options.data[index];return "sin(" + row.x + ") = " + row.y;}' )
            ->data( [
                      [ "y" => '2006', "a" => 100, "b" => 90 ],
                      [ "y" => '2007', "a" => 75, "b" => 65 ],
diff --git a/composer.json b/composer.json
index c4be31f..0b702a7 100644
--- a/composer.json
+++ b/composer.json
@@ -1,6 +1,6 @@
 {
   "name": "gfazioli/laravel-morris-php",
-  "version": "1.0.3",
+  "version": "1.0.4",
   "homepage": "https://github.com/gfazioli/laravel-morris-php",
   "license": "MIT",
   "type": "library",
diff --git a/src/Morris/MorrisBase.php b/src/Morris/MorrisBase.php
index 675f25a..f5a3780 100644
--- a/src/Morris/MorrisBase.php
+++ b/src/Morris/MorrisBase.php
@@ -53,6 +53,12 @@ class MorrisBase
    */
   protected $data = [];
 
+  protected $functions = [
+    'hoverCallback',
+    'formatter',
+    'dateFormat'
+  ];
+
   /**
    * Create an instance of Morris class
    *
@@ -83,6 +89,11 @@ public function toArray()
       if ( '__' == substr( $property, 0, 2 ) || '' === $value || is_null( $value ) || ( is_array( $value ) && empty( $value ) ) ) {
         continue;
       }
+
+      if ( in_array( $property, $this->functions ) && substr( $value, 0, 8 ) == 'function' ) {
+        $value = "%{$property}%";
+      }
+
       $return[ $property ] = $value;
     }
 
@@ -98,7 +109,21 @@ public function toArray()
    */
   public function toJSON()
   {
-    return json_encode( $this->toArray() );
+    $json = json_encode( $this->toArray() );
+
+    return str_replace(
+      [
+          '"%hoverCallback%"',
+          '"%formatter%"',
+          '"%dateFormat%"',
+      ],
+      [
+          $this->hoverCallback,
+          $this->formatter,
+          $this->dateFormat,
+      ],
+      $json
+    );
   }
 
   /**