diff --git a/url2markdown/file.py b/url2markdown/file.py
index 960937e..3399b81 100644
--- a/url2markdown/file.py
+++ b/url2markdown/file.py
@@ -2,7 +2,7 @@ import markdownify
 
 
 def write_to_file(article, header):
-    markdown = markdownify.markdownify(article.html)
     with open(str(article.title) + ".md", 'a') as f:
+    markdown = markdownify.markdownify(article.html, heading_style='ATX')
         f.write(header)
         f.write(markdown)