diff --git a/yt_dlp/extractor/underline.py b/yt_dlp/extractor/underline.py
index 6d3d1588b..9593aa069 100644
--- a/yt_dlp/extractor/underline.py
+++ b/yt_dlp/extractor/underline.py
@@ -27,7 +27,7 @@ class UnderlineIE(InfoExtractor):
     _TESTS = [
         {
             "params": {
-                "skip_download": True,
+                "skip_download": True,  # needs cookies
             },
             "url": "https://underline.io/events/342/posters/12863/poster/66463-mbti-personality-prediction-approach-on-persian-twitter?tab=video",
             "md5": "md5:eaa894161adaef6efd6008681e1cd2c5",
@@ -36,22 +36,11 @@ class UnderlineIE(InfoExtractor):
                 "id": "342/posters/12863/poster/66463-mbti-personality-prediction-approach-on-persian-twitter",
                 "ext": "mp4",
                 "title": "MBTI Personality Prediction Approach on Persian Twitter",
-                # * A value
-                # * MD5 checksum; start the string with md5:
-                # * A regular expression; start the string with re:
-                # * Any Python type, e.g. int or float
             },
         }
     ]
 
     def _real_extract(self, url):
-        # cookies = self._get_cookies(url)
-        # if DEBUG_P:
-        #     ic(cookies)
-
-        # if not cookies:
-        #     self.raise_login_required('Cookies are needed to download from this website', method='cookies')
-
         video_id = self._match_id(url)
         webpage = self._download_webpage(url, video_id)
 
@@ -64,13 +53,9 @@ def _real_extract(self, url):
         )
 
         if DEBUG_P:
-            # ic(webpage_info)
             with open("./tmp.json", "w") as f:
                 json.dump(webpage_info, f)
 
-            # ic(webpage_info["props"]["pageProps"]["snapshot"]["models"][10]["title"])
-            # embed()
-
         title = list(gen_dict_extract(webpage_info, "title"))
         if DEBUG_P:
             ic(title)
@@ -93,8 +78,11 @@ def _real_extract(self, url):
 
         m3u8_url = url
         if m3u8_url:
-            formats.extend(self._extract_m3u8_formats(
-                m3u8_url, video_id, ext='mp4', entry_protocol='m3u8_native'))
+            formats.extend(
+                self._extract_m3u8_formats(
+                    m3u8_url, video_id, ext="mp4", entry_protocol="m3u8_native"
+                )
+            )
 
         return {
             "id": video_id,