diff --git a/README.md b/README.md
index fb7731f..d45e7a7 100644
--- a/README.md
+++ b/README.md
@@ -220,7 +220,7 @@ PHPValidator provides a variety of predefined rules that you can use for data va
     - Validates that a field's value is not in a specified set.
 
     ```php
-    'value' => 'not_in:["foo", "bar"]'
+    'value' => 'not_in:foo,bar'
     ```	
 20. **Required With Rule**
     - Requires the field to be present if another specified field is present.
diff --git a/src/Rules/MaxLengthRule.php b/src/Rules/MaxLengthRule.php
index a19723b..f574d43 100644
--- a/src/Rules/MaxLengthRule.php
+++ b/src/Rules/MaxLengthRule.php
@@ -50,7 +50,30 @@ public function passes(string $field, $value, array $data): bool
         $maxLength = $this->parameters[0] ?? 0;
 
         // Check if the value is a string and its length is within the specified maximum.
-        return is_string($value) && mb_strlen($value) <= $maxLength;
+        if (is_string($value)) {
+            $value = mb_strlen($value);
+        }
+
+        if (is_array($value)) {
+            $value = count($value);
+        }
+
+        if (is_file($value)) {
+
+            if (isset($_FILES[$value]) && $_FILES[$value]["error"] == 0) {
+                // Get the file size in bytes
+                $size = $_FILES[$value]["size"];
+
+                // Convert bytes to kilobytes
+                $size_kb = $size / 1024; // kilobytes
+
+                $value = $size_kb;
+            }
+
+            return false;
+        } 
+
+        return $value <= $maxLength;
     }
 
     /**