diff --git a/src/Document.php b/src/Document.php
index 320c39b..62103aa 100644
--- a/src/Document.php
+++ b/src/Document.php
@@ -36,10 +36,10 @@ class Document
                 case Parser\Header::match($line):
 
                     $this->_entity[] = new Entity\Header(
-                        Parser\Header::getLevel(
+                        Parser\Header::getText(
                             $line
                         ),
-                        Parser\Header::getText(
+                        Parser\Header::getLevel(
                             $line
                         )
                     );
diff --git a/src/Entity/Header.php b/src/Entity/Header.php
index df3b830..e23a6f6 100644
--- a/src/Entity/Header.php
+++ b/src/Entity/Header.php
@@ -13,8 +13,8 @@ class Header
     private ?string $_text;
 
     public function __construct(
-        int $level,
-        ?string $text = null
+        ?string $text = null,
+        int $level = 1
     ) {
         $this->setLevel(
             $level