diff --git a/tests/test_header.py b/tests/test_header.py
index c39cb79..556b236 100644
--- a/tests/test_header.py
+++ b/tests/test_header.py
@@ -3,18 +3,14 @@ import url2markdown.header as header
 
 def test_undefined_topics(create_article):
     article = create_article()
-    result = header._build_header_dict(article)
+    string_header = header.Header(article, [])
+    result = string_header._build_header_dict()
     assert result['topics'][0] == 'to_categorise'
 
 
-def test_get_topics_from_cli():
-    header._get_topics_from_cli()
-    assert False
-
-
 def test_dict_to_string(create_article):
     article = create_article()
     article.keywords = ['foo', 'bar', 'baz']
-    raw_header = header._build_header_dict(article)
-    string = header._build_header_string(raw_header)
+    string_header = header.Header(article, [])
+    string = string_header.build_header()
     assert string == '- meta:\n  - topics: [[foo]] [[bar]] [[baz]]\n  - date: [[2020-10-09]]\n  - authors: [[Daniel Waldmeier]] [[Kei Zuefall]]\n  - url: https://www.20min.ch/story/corona-zahlen-auf-einen-blick-803083076953\n'
diff --git a/url2markdown/header.py b/url2markdown/header.py
index f8578bf..4b44826 100644
--- a/url2markdown/header.py
+++ b/url2markdown/header.py
@@ -1,47 +1,50 @@
 from datetime import datetime
 
 
-def _get_topics_from_cli():
-    pass
+class Header():
+    def __init__(self, article, cli_topics):
+        self.article = article
+        self.cli_topics = cli_topics
 
 
-def _build_header_dict(article):
-    header = {}
-    header['topics'] = _get_topics_from_cli()
-    header['date'] = []
-    if article.authors:
-        header['authors'] = article.authors
-    if article.keywords:
-        if header['topics']:
-            header['topics'].append(article.keywords)
+    def _build_header_dict(self):
+        header = {}
+        header['topics'] = self.cli_topics
+        header['date'] = []
+        if self.article.authors:
+            header['authors'] = self.article.authors
+        if self.article.keywords:
+            if header['topics']:
+                header['topics'].append(self.article.keywords)
+            else:
+                header['topics'] = self.article.keywords
+        if not header['topics']:
+            header['topics'] = ['to_categorise']
+        if self.article.url:
+            header['url'] = self.article.url
+        if self.article.publish_date:
+            header['date'].append(
+                self.article.publish_date.strftime('%Y-%m-%d'))
         else:
-            header['topics'] = article.keywords
-    if not header['topics']:
-        header['topics'] = ['to_categorise']
-    if article.url:
-        header['url'] = article.url
-    if article.publish_date:
-        header['date'].append(article.publish_date.strftime('%Y-%m-%d'))
-    else:
-        header['date'].append(datetime.now().strftime('%Y-%m-%d'))
-    return header
+            header['date'].append(datetime.now().strftime('%Y-%m-%d'))
+        return header
 
 
-def _build_header_string(raw_header):
-    header = "- meta:\n"
-    for key, value in raw_header.items():
-        if value and type(value) == list:
-            content = ""
-            for child in value:
-                content += " [[" + child + "]]"
-            header += "  - {0}:".format(key) + content + "\n"
-        elif value:
-            content = " " + str(value)
-            header += "  - {0}:".format(key) + content + "\n"
-    return header
+    def _build_header_string(self, raw_header):
+        header = "- meta:\n"
+        for key, value in raw_header.items():
+            if value and type(value) == list:
+                content = ""
+                for child in value:
+                    content += " [[" + child + "]]"
+                header += "  - {0}:".format(key) + content + "\n"
+            elif value:
+                content = " " + str(value)
+                header += "  - {0}:".format(key) + content + "\n"
+        return header
 
 
-def build_header(article):
-    raw_header = _build_header_dict(article)
-    header = _build_header_string(raw_header)
-    return header
+    def build_header(self):
+        raw_header = self._build_header_dict()
+        self.header = self._build_header_string(raw_header)
+        return self.header